subject:(Ni Al Re Ru Alloys)

Indian Institute of Science

1. Vinay, K S. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.

Degree: MSc Engg, Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4056

► Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their… (more)

▼ Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their mechanical properties at temperatures close to 0.8 of their melting point. The modern day nickel based superalloys are multicomponent alloys, containing up to 12 alloying elements which are added in balanced proportions to achieve high temperature strength and microstructural stability, Re and Ru have been the recent additions made to superalloy compositions in the last two decades. But the roles of Re and Ru in terms of partitioning among the phases γ and γ’ and its effects on mechanical properties are still not clear. Hence an effort was made to study their effects under constrains of constant volume fractions of γ’ and misfit between γ and γ’, to isolate effects that result purely due to composition. Three model alloy systems (two ternary and one quaternary) of the type Ni-Al-xRe, Ni-Al-yRu and Ni-Al-xRe-yRu, x=2.5/4 and y=2.5/6 with minor additions of 1.4 Hf and 0.07 C for reasons of castability were synthesized by investment casting. This thesis deals with the solidification related aspects of these alloys. Chapter 1 deals with a brief overview of Ni based superalloys in terms of their physical metallurgy, processing, microstructure and the effects of Re and Ru studied in literature. These are summarized and the objective of thesis laid out. The experimental details of the techniques employed for studying the cast structure such as optical microscopy, scanning electron microscopy, electron probe microanalysis and differential scanning calorimetry are discussed in Chapter 2 In Chapter 3, the experimental results concerning microstructure, chemistries (local and global), differential scanning calorimetry and supporting Thermo-Calc based simulations are presented. The composition of the directionally solidified alloys were estimated using quantitative EPMA spot analysis after homogenizing them to the best possible extent. The cooling rates experienced by the bottom, middle and tip sections (25mm, 150mm and 295mm respectively from chill plate) of the model alloys during casting was estimated using ProCASTTM simulations. The simulations show the cooling rates to vary from 12.5 K/min to 6 K/min, corresponding to the range of thermal gradients 3000 K/m to 1500 K/m from bottom to tip sections. These estimations were performed assuming a constant withdrawal velocity of 24 cm/hr. The morphological evolution of cast structure from bottom to tip section of the alloys was studied at a coarse scale with the aid of optical microscopy. A tendency towards increased branching of dendrites to form well developed tertiary arms is observed on moving from bottom to tip sections. Quantitative measurement of primary and secondary arm spacings (PDAS and SDAS) indicate that PDAS values increase from bottom to middle section and then saturates, whereas the SDAS values show an increase from bottom to tip sections. Also, the PDAS and SDAS values of MA-3 were observed to be… Advisors/Committee Members: Banerjee, Dipankar (advisor).

Subjects/Keywords: Nickel Based Superalloys; Solidification Alloys; Alloy Composition; Ni-Based Superalloys; Ni-Al-Re/Ru Alloys; Materials Engineering

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APA (6^th Edition):

Vinay, K. S. (2018). Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4056

Chicago Manual of Style (16^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Masters Thesis, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/4056.

MLA Handbook (7^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Web. 18 Jan 2021.

Vancouver:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/4056.

Council of Science Editors:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/4056

Indian Institute of Science

2. Padaikathan, P. Development of High Temperature Aluminium Alloys through Microstructure Control.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3890

► A large number of advanced structural materials are based on metallic materials where alloying additions play a key role in imparting the required properties. Most… (more)

▼ A large number of advanced structural materials are based on metallic materials where alloying additions play a key role in imparting the required properties. Most of the commercially important aluminium alloys are classified by the nature of the alloying additions. Among them the 2219, 2618, 5086, and 7075 are important class of lightweight alloys that plays critical role in modern engineering application. However, despite having a series of commercially useful aluminum alloys for commercial applications the increasing need of improved performance requires newer development in particular for applications that require high strength at elevated temperatures and performance at extreme environments. Precipitations of the intermetallic compounds containing copper during thermal treatments play a very important role in developing high strength aluminium alloys. Although,these precipitates are stable at fairly high temperatures, the rapid coarsening of these second phase precipitates (e.g. Al2Cu), leads to loss of strength at elevated temperature. Several approaches are explored to overcome this problem. One of them is to utilize non-equilibrium solidification route, which can increase solid solubility and hence increasing the precipitate density. Nonequilibrium processing can also alter the selection pathway of the competitive phases and evolution of the microstructure. Recently, non–equilibrium solidification by suction casting technique is becoming increasingly popular for casting of metallic materials of any shape. In this technique solidification is effected by sucking the molten alloy into water cooled copper mold using a suction force resulting from the differences between the melting chamber in Argon gas pressure and casting chamber under vacuum. The present thesis aims to develop a set of newer alloys with small amount of alloying additions primarily based on nickel that can retain reasonable strength at high temperature by utilizing the non-equilibrium solidification route. In addition to Ni (≤ 0.10at.%), the thesis present results of the effect of minor addition of Sc and Zr as ternary and quaternary additions. Following a short review in chapter 2, Chapter 3 presents the experimental techniques adopted for both preparation of alloys and their characterization. Chapter 4 deals with the results of alloying of aluminum with minor amount of nickel. The Ni in the range of 0.05-0.20at% was used to develop a high temperature template, containing a set of hardening intermetallic compounds to increase the strength of the host matrix. The microstructural investigations of the suction cast alloys reveal a characteristic feathery microstructure. At higher magnification the microstructure reveals the presence of fine dispersions of a second phase. Both x-ray and transmission electron microscopy confirms the phase in the dispersions to be primarily crystalline Al9Ni2 phase having a monoclinic crystal structure. This phase does not exist in equilibrium phase diagram. Only at higher concentration one can observe equilibrium… Advisors/Committee Members: Chattopadhyay, Kamanio (advisor).

Subjects/Keywords: Aluminium Alloys - Microstructure Ccontrol; Aluminium High Tempreture; Metallography - Aluminium Alloys; Metallic Material Structure; High Temperature Aluminum Alloys; Al-Ni-Zr Alloys; Al-Ni Alloys; Al-Ni-Sc-Zr Alloys; Materials Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Padaikathan, P. (2018). Development of High Temperature Aluminium Alloys through Microstructure Control. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3890

Chicago Manual of Style (16^th Edition):

Padaikathan, P. “Development of High Temperature Aluminium Alloys through Microstructure Control.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/3890.

MLA Handbook (7^th Edition):

Padaikathan, P. “Development of High Temperature Aluminium Alloys through Microstructure Control.” 2018. Web. 18 Jan 2021.

Vancouver:

Padaikathan P. Development of High Temperature Aluminium Alloys through Microstructure Control. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/3890.

Council of Science Editors:

Padaikathan P. Development of High Temperature Aluminium Alloys through Microstructure Control. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3890

Indian Institute of Science

3. Tiwary, Chandra Sekhar. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2991

► The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions… (more)

▼ The thesis introduces a novel alloy system based on submicron distributions of intermetallic phases realised through eutectic solidification in the ternary system Ni-Al-Zr. Various compositions in this system comprising of intermetallic phases distributed in different eutectic structures show ultra-high strength at temperatures upto 700°C combined with reasonable tensile plasticity, exceptional oxidation resistance and high temperature structural stability. Intermetallics have long been used in high temperature alloys systems such as in the classical Ni-base superalloys that derive their strength from nanoscale dispersions of the aluminide, Ni3Al(γ’) in a matrix of disordered fcc Ni (γ), alloyed with expensive, high density refractory elements such as Re and Ru. The high temperature applications of intermetallics derive from their strength retention to high temperatures, creep resistance enabled by low diffusion rates, and attractive oxidation resistance based on high concentration of elements such as Al that forms stable oxides. Several decades of effort on the development of new generation of intermetallic alloys through the 80’s and 90’s have gone unrewarded, with the exception of TiAl based alloys that are now used in recent generation aircraft engines. The promise of intermetallics as high temperature candidate materials is limited by their poor ductility or toughness arising from several intrinsic properties such as low grain boundary cohesive strength (in the case of Ni3Al) or an insufficient number of slip systems (as in NiAl) or extrinsic effects such as embrittlement by hydrogen (Fe3Al) that derive fundamentally from the existence of directionality in bonding. However, low ductility or toughness can often be alleviated by limiting the length scale for slip. We have therefore examined the possibility of combining intermetallics in the form of eutectic structures, potentially limiting slip lengths within each intermetallic constituent. Eutectic structures in binary systems limit the choice of intermetallic combinations so that finding such combinations with engineering potential is difficult. On the other hand combinations of three elements or more would enable a significantly larger set of permutations of eutectic intermetallics, provided the constituent binary phase diagrams contain either eutectic or peritectic reactions involving intermetallic phases, as well as intermediate intermetallic phases. The ternary Ni-Al-Zr system met our criterion in several ways. The Ni-Al binary phase diagram shows a peritectic reaction from liquid and NiAl (Pm 3m, B2 with a lattice parameter of 0.288nm) to form Ni3Al (Pm 3m, L12 with a lattice parameter of 0.356 nm), intermetallics that have been extensively investigated in earlier literature. The Ni-Zr system shows a peritectic reaction between liquid and the Ni7Zr2 (C12/m1 with a lattice parameters a=0.469nm, b=0.823nm, c=1.219nm) phase to form the intermetallic Ni5Zr (F 43m with a lattice parameter of 0.670nm). Further the NiAl and Ni7Zr2 are both intermediate phases… Advisors/Committee Members: Chattopadhyay, K (advisor), Banerjee, Dipankar (advisor).

Subjects/Keywords: Intermetallic Alloys; Nickel-Aluminium-Zirconium Eutectic Alloys; Ni-Al-Zr Alloys; Ternary Alloys; Intermetallic Eutectic Composites; Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tiwary, C. S. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2991

Chicago Manual of Style (16^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/2991.

MLA Handbook (7^th Edition):

Tiwary, Chandra Sekhar. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys.” 2018. Web. 18 Jan 2021.

Vancouver:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/2991.

Council of Science Editors:

Tiwary CS. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Ternary Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2991

4. SILVA NETO, José Sabino da. Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano .

Degree: 2019, Universidade Federal de Pernambuco

URL: https://repositorio.ufpe.br/handle/123456789/33820

► Devido à crescente demanda por fontes de energia limpa, o estudo de rotas para produção de hidrogênio torna-se importante tendo em vista seu alto potencial… (more)

▼ Devido à crescente demanda por fontes de energia limpa, o estudo de rotas para produção de hidrogênio torna-se importante tendo em vista seu alto potencial energético bem como o fato da sua combustão não resultar na produção de gases poluentes e sim na formação de água como produto principal. Neste contexto, processos de produção de hidrogênio a partir da conversão direta do metano, bem como a reforma seca, se destacam haja vista o benefício ambiental da utilização de gases de efeito estufa como reagentes para produção de hidrogênio, que é fonte de energia limpa, bem como para a formação de produtos de alto valor agregado. Entretanto, muitos são os desafios impostos aos processos de conversão do metano, em especial aos de conversão direta, como a desidroaromatização, sendo imprescindível o emprego de catalisadores com alta atividade catalítica, seletividade e estabilidade. O presente trabalho tem como objetivo geral a síntese e caracterização de catalisadores ativos para a reação de reforma seca (RSM) e desidroaromatização do metano (DAM) visando a aplicação destes no processo combinado das duas reações (DAM/RSM) em reator de leito fixo com membrana seletiva à hidrogênio. Os catalisadores foram sintetizados por meio do método de impregnação por via úmida, sendo o catalisador preparado para uso na RSM foi a alumina gama impregnada com níquel (Ni/ γ-Al₂O₃), e para aplicação na DAM foi realizada a síntese da zeólita HZSM-5 impregnada com molibdênio e rutênio (Ru-Mo/HZSM-5). Os catalisadores preparados foram caracterizados por difração de raios X (DRX); espectroscopia infravermelha com transformada de Fourier (FTIR); análise termogravimétrica e termogravimetria derivada (TGA/DTG); análise de porosidade e área superficial por BET/BJH e espectrometria por absorção atômica (AAS). As caracterizações indicaram que a impregnação metálica foi efetiva, sendo identificada concentração de 1,49% de Ni no catalisador Ni/ γ-Al₂O₃ e evidências de impregnação metálica no DRX do catalisador Ru-Mo/HZSM-5. A impregnação metálica nos suportes comerciais sugere que foram obtidos catalisadores ativos para o processo combinado DAM/RSM, sendo possível aplicá-los no estudo da influência da configuração do leito fixo catalítico, sem/com membrana seletiva à hidrogênio, e parâmetros relacionados a atividade e estabilidade dos catalisadores durante a reação, bem como na avaliação do efeito de parâmetros operacionais tais como: temperatura; vazão e fração de CO₂/CH₄ na alimentação do processo. Advisors/Committee Members: BENACHOUR, Mohand (advisor), MACIEL, Leonardo José Lins (advisor), http://lattes.cnpq.br/2445243904431423 (advisor).

Subjects/Keywords: Engenharia Química; Caracterização; Desidroaromatização; Hidrogênio; Reforma Seca; Síntese Ni/ γ-Al₂O₃; Síntese Ru-Mo/HZSM-5

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

SILVA NETO, J. S. d. (2019). Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano . (Masters Thesis). Universidade Federal de Pernambuco. Retrieved from https://repositorio.ufpe.br/handle/123456789/33820

Chicago Manual of Style (16^th Edition):

SILVA NETO, José Sabino da. “Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano .” 2019. Masters Thesis, Universidade Federal de Pernambuco. Accessed January 18, 2021. https://repositorio.ufpe.br/handle/123456789/33820.

MLA Handbook (7^th Edition):

SILVA NETO, José Sabino da. “Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano .” 2019. Web. 18 Jan 2021.

Vancouver:

SILVA NETO JSd. Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano . [Internet] [Masters thesis]. Universidade Federal de Pernambuco; 2019. [cited 2021 Jan 18]. Available from: https://repositorio.ufpe.br/handle/123456789/33820.

Council of Science Editors:

SILVA NETO JSd. Síntese e caracterização dos catalisadores Ni/γ-Al₂O₃ e Ru-Mo/HZSM-5 visando aplicação na produção de hidrogênio pelo processo combinado de reforma seca/desidroaromatização do metano . [Masters Thesis]. Universidade Federal de Pernambuco; 2019. Available from: https://repositorio.ufpe.br/handle/123456789/33820

Indian Institute of Science

5. Gunjal, Vilas Vishnu. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/2965

► The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent… (more)

▼ The excellent high temperature microstructure stability, high strength, and oxidation resistance of intermetallics has for long driven the development of intermetallic based alloys. More recent studies demonstrated attractive properties of eutectic intermetallic in the Ni-Al-Zr systems. This thesis deals with study of binary Ni3Al+Ni7Zr2, NiAl+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary intermetallic eutectic alloys in this system and includes the identification of compositions that would yield each eutectic structure and their microstructural characterization, mechanical and oxidation behavior. The thesis is divided into six chapters. Chapter 1 reviews the study on high temperature materials development and presents the objectives of work in the current thesis. Various experimental techniques used for alloy preparation (vacuum arc melting and vacuum suction casting), microstructural characterization (optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray Diffraction (XRD), electron probe micro analyzer (EPMA), differential scanning calorimetry (DSC)), compression tests, microhardness tests and thermo gravimetric analysis (TGA) are described in Chapter 2. The specific background of work related to each chapter together with experimental results and discussion are given in next three chapters. Chapter 3 reports the method of identification of the composition for each of the eutectic alloys referred to above. The identification of alloy compositions of binary eutectics Ni3Al+Ni7Zr2 (Ni-13.5Al-11Zr), NiAl+Ni7Zr2 (Ni-19Al-12Zr) and Ni3Al+NiAl+Ni7Zr2 ternary eutectic (Ni-18.4Al-11.6Zr) is carried out with the help of available liquidus projection of Ni-Al-Zr system, and the iterative melting of numerous compositions that were refined to define the critical compositions for each eutectic. The microstructural features of these alloys have been characterized using optical and electron microscopy. Phase identification is confirmed by X ray diffraction, EPMA and TEM. The microstructure of Ni3Al+Ni7Zr2 and Ni3Al+NiAl+Ni7Zr2 ternary eutectic alloy shows similar eutectic morphologies. The eutectic colony consists of lamellar plates at center and intermixed lamellar-rod irregular morphologies towards the boundaries of the colonies. However, the NiAl+Ni7Zr2 eutectic alloy shows a fine, lamellar plate morphology throughout the microstructure. The orientation relationship between eutectic phases is determined using TEM technique for each alloy composition. Onsets of melting and liquidus temperatures have been identified by Differential Scanning Calorimetry. Modified liquidus projections of Ni-Al-Zr system near the Ni3Al+NiAl+Ni7Zr2 ternary eutectic region have been derived from present experimental work. Chapter 4 focuses on understanding the mechanical behaviour of these individual eutectics at room temperature and high temperature. An attempt has been made to correlate the microstructure and mechanical properties of eutectics by measuring room temperature hardness, compressive yield strength… Advisors/Committee Members: Banerjee, D (advisor).

Subjects/Keywords: Intermetallic Eutectic Alloy; Nickel Aluminium Zirconium Alloys; Binary Eutectics; Ternary Eutectics; Eutectic Alloys; Eutectics; Ni3Al; Ni-Al-Zr Alloys; Ni7Zr2; Ni-Al-Zr System; Materials Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gunjal, V. V. (2018). Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2965

Chicago Manual of Style (16^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/2965.

MLA Handbook (7^th Edition):

Gunjal, Vilas Vishnu. “Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys.” 2018. Web. 18 Jan 2021.

Vancouver:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/2965.

Council of Science Editors:

Gunjal VV. Microstructural, Mechanical and Oxidation Behavior of Ni-Al-Zr Intermetallic Eutectic Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2965

Indian Institute of Science

6. Bhaskar, Mithipati Siva. Precipitate Growth and Coarsening in Ternary Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3976

► We have studied precipitate growth and coarsening in ternary alloys using two different phase held models. The first one is a ternary extension of the… (more)

▼ We have studied precipitate growth and coarsening in ternary alloys using two different phase held models. The first one is a ternary extension of the classical Cahn-Hilliard (C-H) model in which both the phases are characterized using conserved held variables i.e. composition (cB; cC ); mobility matrix and gradient energy efficient are the other input parameters in this model. In the second model, each phase is treated as separate, and phase identify cation is through a (non-conserved) phase held variable ; we have used a grand potential-based (GP) formulation, due to Plapp [1], Choudhury and Nestler [2], where interfacial energy and interface width, as well as free energy and diffusivity matrix for the relevant phases are the input parameters. The first model i.e. the Cahn-Hilliard (C-H) type model is conceptually simple. The model for ternary is a straight forward extension of the binary. The grand potential (GP) formulation has the advantage of being able to incorporate thermodynamic database like Thermocalc in it. We present below a summary of the findings of our research on (a) precipitate growth, precipitate coarsening, and (c) a critical comparison between results from phase held simulations and those from experiments on an Ni-Al-Mo alloy Precipitate growth In our study of precipitate growth in ternary alloys, we end that when both the solute elements have the same diffusivity, precipitate growth behaviour in ternary alloys is identical to that binary alloys; specifically, we recover the temporal power law r2 = kgt relating the particle radius to time, and the growth kg depends only on supersaturation (i.e., equilibrium volume fraction of the precipitate phase), and is independent of the slope of the tie line. However, when one solute element, (say, C) di uses slower than the other (i.e. (DCC =DBB) < 1,(where DBB, DCC are intertie suavities’ in the lab frame of reference), the ux of C at the interface is smaller than that of species B, causing the precipitate to become depleted in C and enriched in B; this process continues until the growth phase enters a scaling regime where we recover the temporal law for growth: r2 = kgt. In this regime, the tie line selected by the precipitate and matrix interfacial compositions is different from the thermodynamic tie line containing the alloy, a result first reported by Coates [3]. After validating our phase held model quantitatively through a critical comparison with Coates' theory of tie line selection, we have characterized the growth behaviour: specifically, we end that growth kg drops with decreasing value of DCC ; the magnitude of this drop is stronger for alloys which (a) are on higher-C tie lines (i.e., the slope of the tie line is higher), and (b) have smaller precipitate volume fractions. Precipitate coarsening In our simulations, we end that precipitate coarsening does indeed enter a scaling regime where the temporal power law r3 = kt (which relates the average precipitate radius r to (b) time t) is valid; the coarsening rate k depends, as expected,… Advisors/Committee Members: Abinandanan, T A (advisor).

Subjects/Keywords: Ternery Alloys; Ternery Alloys - Precipitate Growth; Precipitate Coarsening; Cahn-Hilliard Model; Grand Potential Model; Ni-Al-Mo Alloys; Coates' Theory; Multicomponent Alloys; Materials Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bhaskar, M. S. (2018). Precipitate Growth and Coarsening in Ternary Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3976

Chicago Manual of Style (16^th Edition):

Bhaskar, Mithipati Siva. “Precipitate Growth and Coarsening in Ternary Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/3976.

MLA Handbook (7^th Edition):

Bhaskar, Mithipati Siva. “Precipitate Growth and Coarsening in Ternary Alloys.” 2018. Web. 18 Jan 2021.

Vancouver:

Bhaskar MS. Precipitate Growth and Coarsening in Ternary Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/3976.

Council of Science Editors:

Bhaskar MS. Precipitate Growth and Coarsening in Ternary Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3976

University of Western Ontario

7. Fu, Bolin. Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys.

Degree: 2020, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/7535

► This thesis aims to study the local mechanical properties of high pressure die cast (HPDC) AE44-2 and AE44-4 alloys at 25˚C and 200˚C and their… (more)

Subjects/Keywords: Mg-Al-RE alloys; Spherical indentation testing; Elevated temperature mechanical properties; Materials Science and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fu, B. (2020). Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/7535

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fu, Bolin. “Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys.” 2020. Thesis, University of Western Ontario. Accessed January 18, 2021. https://ir.lib.uwo.ca/etd/7535.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fu, Bolin. “Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys.” 2020. Web. 18 Jan 2021.

Vancouver:

Fu B. Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys. [Internet] [Thesis]. University of Western Ontario; 2020. [cited 2021 Jan 18]. Available from: https://ir.lib.uwo.ca/etd/7535.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fu B. Characterization Of The Mechanical Performance Of The AE44-2 And AE44-4 High Pressure Die Cast Mg-Rare Earth Alloys. [Thesis]. University of Western Ontario; 2020. Available from: https://ir.lib.uwo.ca/etd/7535

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. Du, Ningning. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.

Degree: PhD, Division of Engineering. Mechanics of Solids, 2009, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:193/

► When deformed at elevated temperature and slow strain rates, some Al alloys exhibits superplasticity, the ability to sustain very large tensile elongations (sometimes over 1000%)… (more)

Subjects/Keywords: Al alloys

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APA (6^th Edition):

Du, N. (2009). Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:193/

Chicago Manual of Style (16^th Edition):

Du, Ningning. “Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.” 2009. Doctoral Dissertation, Brown University. Accessed January 18, 2021. https://repository.library.brown.edu/studio/item/bdr:193/.

MLA Handbook (7^th Edition):

Du, Ningning. “Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature.” 2009. Web. 18 Jan 2021.

Vancouver:

Du N. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. [Internet] [Doctoral dissertation]. Brown University; 2009. [cited 2021 Jan 18]. Available from: https://repository.library.brown.edu/studio/item/bdr:193/.

Council of Science Editors:

Du N. Multi-scale Modeling of Deformation and Failure Mechanisms of Al Alloys at Elevated Temperature. [Doctoral Dissertation]. Brown University; 2009. Available from: https://repository.library.brown.edu/studio/item/bdr:193/

Indian Institute of Science

9. Srinivasan, Dheepa. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.

Degree: PhD, Faculty of Engineering, 2011, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1527

Subjects/Keywords: Aluminium Alloys - Metallography; Aluminium Alloys - Metallurgy; Al Alloys; Al-Si-Zr; Al-Cu-Zr; Al-Ni-Z; Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Srinivasan, D. (2011). Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1527

Chicago Manual of Style (16^th Edition):

Srinivasan, Dheepa. “Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.” 2011. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/1527.

MLA Handbook (7^th Edition):

Srinivasan, Dheepa. “Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys.” 2011. Web. 18 Jan 2021.

Vancouver:

Srinivasan D. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2011. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/1527.

Council of Science Editors:

Srinivasan D. Phase Evolution, Thermal Stability And Hardness Of Melt Spun Nanocrystalline Al-X-Zr (X=Si,Cu,Ni) Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1527

Indian Institute of Science

10. Suryawanshi, Jyoti Balaji. Mechanical and Corrosion Properties of Selective Laser Melted Alloys.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3604

► Selective laser melting (SLM) of metallic powders is an additive manufacturing technique that is widely employed to produce 3D components, and is fast becoming an… (more)

▼ Selective laser melting (SLM) of metallic powders is an additive manufacturing technique that is widely employed to produce 3D components, and is fast becoming an important method for manufacturing near-net shape and complex metallic parts. In this thesis, a comprehensive investigation on the effect of SLM on the mechanical and corrosion properties of the Al-12Si (AS), 316L stainless steel (SS), and 18(Ni)-300 grade managing steel (MS) is investigated, with particular emphasis on the developing (micro- as well as mesa-)structure -property correlations. Detailed microstructural characterization combined with quasi-static tensile, fracture toughness, fatigue crack growth, and unmatched fatigue tests were conducted. The effect of post-SLM heat treatment as well as the scanning strategy (linear vs. checker board hatch style) was examined and the results are compared with those of conventionally manufactured (CM) counterparts. The SLM alloys exhibit a mesostructured, in addition to the fine cellular structure along the boundaries. In a case of SLM-AS, the fine cellular structure imparts higher strength at the cost of ductility, while the mesostructured, which arises due to the laser track hatching, causes the crack path to be tortuous, and in turn leads to substantial increase in fracture toughness. This imparts significant anisotropy to the toughness while tensile properties are nearly-isotropic. The experimental results of SLM-SS also show that higher tensile strengths properties with a marked reduction ductility. In spite of these, the fracture toughness, which ranges between 63 and 87 MPa.m0.5, of the SLM-SS is good, which is a result of the mesostructured induced crack tortuousity.Both tensile and toughness properties of SLM-SS were found to be anisotropic in nature. Upon aging SLM-MS, nanoscale precipitation of intermetallic compounds occurs within the cells that, in turn, lead in marked improvements in tensile strengths properties, but substantial reductions in ductility and fracture toughness. Overall, the mechanical performance, except ductility, of the SLM-MS after aging is found to be similar to that of CM-MS. Importantly, the lack of ductility does not lead to a reduction in toughness. Although the SLM-MS alloy possesses a mesostructured, no significant anisotropy in the mechanical behaviour is observed. The unnoticed studies on SLM-AS, -SS, and -MS reveal that the tensile residual stresses, gas-pores, and unmelted powder particles, can degrade the unmatched highest fatigue properties considerably and hence need be eliminated for high fatigue strength. Room temperature, electrochemical corrosion resistances (CRs) of SLM-AS, -SS and -MS in 0.1M NaCl solution were also evaluated and compared with those CM counterparts. While SLM improves CRs of AS and SS, it degrades that of MS. The results are discussed in terms of microstructural refinement and porosity that are common in SLM alloys. Advisors/Committee Members: Ramamurty, Upadrasta (advisor).

Subjects/Keywords: Laser Melted Alloys; SLM Alloys; Al-12Si Alloy; Selective Laser Melting (SLM); 316L Stainless Steel; Selective Laser Melted Alloys; 18(Ni) 300-grade Maraging Steel; Materials Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Suryawanshi, J. B. (2018). Mechanical and Corrosion Properties of Selective Laser Melted Alloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3604

Chicago Manual of Style (16^th Edition):

Suryawanshi, Jyoti Balaji. “Mechanical and Corrosion Properties of Selective Laser Melted Alloys.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/3604.

MLA Handbook (7^th Edition):

Suryawanshi, Jyoti Balaji. “Mechanical and Corrosion Properties of Selective Laser Melted Alloys.” 2018. Web. 18 Jan 2021.

Vancouver:

Suryawanshi JB. Mechanical and Corrosion Properties of Selective Laser Melted Alloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/3604.

Council of Science Editors:

Suryawanshi JB. Mechanical and Corrosion Properties of Selective Laser Melted Alloys. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3604

Indian Institute of Science

11. Biswas, Tripti. Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach.

Degree: PhD, Faculty of Engineering, 2010, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/750

► The glass-forming composition ranges in Al-La-Ni and Mg-TM (Cu, Zn)-Y alloys were predicted using Miedema’s model. Glass-forming abilities of Al-La-Ni alloys and Mg-Cu-RE alloys were… (more)

Subjects/Keywords: Magnesium Allloys; Aluminium Alloys; Bulk Metallic Glasses; Glass Forming Systems; Glasses - Thermal Stability; Aluminium Alloys - Glass Formation; Magnesium Alloys - Glass Formation; Metallic Alloys - Glass Forming Ability; Glass Formation; Al-La-Ni Alloys; Mg-Cu-RE Alloys; Mg-Zn-Y Alloys; Materials Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Biswas, T. (2010). Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/750

Chicago Manual of Style (16^th Edition):

Biswas, Tripti. “Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach.” 2010. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/750.

MLA Handbook (7^th Edition):

Biswas, Tripti. “Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach.” 2010. Web. 18 Jan 2021.

Vancouver:

Biswas T. Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2010. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/750.

Council of Science Editors:

Biswas T. Studies Of Glass Formation In Al-La-Ni And Mg-TM-RE Alloys With A Structure Mapping Approach. [Doctoral Dissertation]. Indian Institute of Science; 2010. Available from: http://etd.iisc.ac.in/handle/2005/750

Indian Institute of Science

12. Srinivasan, Dheepa. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.

Degree: MSc Engg, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1950

Subjects/Keywords: Aluminium Alloys; Aluminium-Nickel-Zinc Alloys; Al-Ni-Zr Alloys; Al3-Zr Alloys; Al-Zr Alloys; Al3Zr; Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Srinivasan, D. (2013). Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1950

Chicago Manual of Style (16^th Edition):

Srinivasan, Dheepa. “Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.” 2013. Masters Thesis, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/1950.

MLA Handbook (7^th Edition):

Srinivasan, Dheepa. “Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys.” 2013. Web. 18 Jan 2021.

Vancouver:

Srinivasan D. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. [Internet] [Masters thesis]. Indian Institute of Science; 2013. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/1950.

Council of Science Editors:

Srinivasan D. Growth Morphology And Coarsening Of Metastable Al3Zr In Melt Spun Al-Ni-Zr Alloys. [Masters Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/1950

Freie Universität Berlin

13. Enderlein, Carsten. Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie.

Degree: 2010, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-13262

► Graphen gilt auf Grund seiner au\ss erordentlichen elektrischen, optischen und mechanischen Eigenschaften als eines der vielversprechendsten Materialen für eine Vielzahl von zukunftstechnologischen Anwendungen. Dabei wird… (more)

Subjects/Keywords: Graphene; ARPES; Ru(001); Ru(0001); Ni(111); Ni2Si; 500 Naturwissenschaften und Mathematik::530 Physik

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APA (6^th Edition):

Enderlein, C. (2010). Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-13262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Enderlein, Carsten. “Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie.” 2010. Thesis, Freie Universität Berlin. Accessed January 18, 2021. http://dx.doi.org/10.17169/refubium-13262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Enderlein, Carsten. “Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie.” 2010. Web. 18 Jan 2021.

Vancouver:

Enderlein C. Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie. [Internet] [Thesis]. Freie Universität Berlin; 2010. [cited 2021 Jan 18]. Available from: http://dx.doi.org/10.17169/refubium-13262.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Enderlein C. Untersuchung von Graphen und seiner Wechselwirkung mit unterschiedlichen Substraten mit winkelaufgelöster Photoemissionsspektroskopie. [Thesis]. Freie Universität Berlin; 2010. Available from: http://dx.doi.org/10.17169/refubium-13262

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Pieri, Cyril. Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?.

Degree: Docteur es, Chimie, 2012, Aix Marseille Université

URL: http://www.theses.fr/2012AIXM4322

►

Les sources d'approvisionnement en énergie proviennent essentiellement des matières fossiles, qui se raréfient et dont la combustion relargue dans l'atmosphère des polluants et gaz à… (more)

▼

Les sources d'approvisionnement en énergie proviennent essentiellement des matières fossiles, qui se raréfient et dont la combustion relargue dans l'atmosphère des polluants et gaz à effet de serre.Un vecteur d'énergie apparaît comme l'avenir pour subvenir aux besoins énergétiques de la planète : l'hydrogène ; cependant, son coût de production reste très élevé.Dans la nature, des enzymes, les hydrogénases, sont capables de produire et d'oxyder l'hydrogène de manière très efficace. Les scientifiques se sont alors inspirés de ces enzymes afin de concevoir des complexes qui seraient des catalyseurs bien plus robustes pour produire de l'hydrogène.Au cours de cette thèse, nous avons pris comme source d'inspiration les hydrogénases [NiFe], dont le site actif est composé d'un coeur bimétallique Ni-Fe coordiné par quatres ligands thiolates.Nous avons synthétisé divers ligands en vue d'obtenir des complexes polymétalliques de Ni, Fe ou Ru, rassemblant ce qui semble être quelques unes des propriétés clés de l'activité des hydrogénases [NiFe] : ligands thiolate sur le nickel, dont deux pontants avec le second métal, géométrie tétraédrique du nickel. Pour cela, de nouvelles familles de ligands polythiolates ont été conçues et préparées.Les complexes ainsi préparés ont été caractérisés et leur activité évaluée par différentes techniques, dont la voltammétrie cyclique et l'électrolyse couplé à une GC, qui nous ont permis d'évaluer l'activité de nos catalyseurs (TON, TOF, surtension). Un des catalyseurs actifs a été utilisé comme support pour des simulations en DFT qui nous ont aidés à mieux comprendre le mécanisme catalytique de production d'hydrogène.

The energy supply sources are mainly based on fossil materials which are growing scarce and release pollutants and greenhouse gases.In this context, an energy vector appears as the future to feed the energetic needs of the planet: the Hydrogen; but its current production costs remain very high.Nature has deviced enzymes, hydrogenases, able to produce and oxidize hydrogen very efficiently. Nevertheless, the manipulation of these organisms is not easy, notably because of their susceptibility (oxygen inhibition, organic solvents, high temperatures), and their production costs are high.So, scientists have taken this inspiration source in order to design biomimetic and bioinspired models, which would much more robust and cheap catalysts to produce hydrogen.During this thesis, we have drawn our inspiration from [NiFe] hydrogenases, where the active site is a Ni-Fe core coordinated by four thiolate ligands. Our goal has been to design new polythiolate ligands, that gather some of the key hydrogenases [NiFe] properties responsible for their activity: thiolate ligands on the nickel, among them two brinding with the second metal, nickel tetraedric geometry.The synthesised complexes have been characterized and their activity tested (TON, TOF, overvoltage) by different techniques, among them cyclic voltammetry and electrolysis coupled to a GC.Finally, the bests have been tested further,…

Advisors/Committee Members: Réglier, Marius (thesis director), Hardre, Renaud (thesis director).

Subjects/Keywords: Hydrogène; Catalyseurs; Ligands polythiolates; Électrochimie; Complexes Ni Ru; Hydrogen; Catalysts; Ni Ru complexes; Polythiolates ligands; Electrochemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pieri, C. (2012). Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2012AIXM4322

Chicago Manual of Style (16^th Edition):

Pieri, Cyril. “Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?.” 2012. Doctoral Dissertation, Aix Marseille Université. Accessed January 18, 2021. http://www.theses.fr/2012AIXM4322.

MLA Handbook (7^th Edition):

Pieri, Cyril. “Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?.” 2012. Web. 18 Jan 2021.

Vancouver:

Pieri C. Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?. [Internet] [Doctoral dissertation]. Aix Marseille Université 2012. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2012AIXM4322.

Council of Science Editors:

Pieri C. Modèles fonctionnels d’hydrogénases [NiFe] : The true meaning of the invisible hand : the end of a myth ?. [Doctoral Dissertation]. Aix Marseille Université 2012. Available from: http://www.theses.fr/2012AIXM4322

Uppsala University

15. Ångström, Jonas. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.

Degree: Inorganic Chemistry, 2011, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

► Sc(Al_xNi_1-x)₂ is a pseudobinary C14 Laves phase and a potential interstitial hydrogen storage material or anode in a Ni-MH battery. A previous study showed… (more)

Subjects/Keywords: hydrogen storage; Laves phases; Ni-MH batteries; intermetallic compounds; alloy; alloys; Nickel; Hydrogen; Scandium; Sc; Ni; Aluminium; Aluminum; Al; Nickel metal hydride batteries; Laves phase; vätelagrning; Lavesfaser; Ni-MH batteri; intermetalliska föreningar; legering; legeringar; nickel; väte; skandium; aluminium; Lavesfas

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APA (6^th Edition):

Ångström, J. (2011). Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ångström, Jonas. “Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.” 2011. Thesis, Uppsala University. Accessed January 18, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ångström, Jonas. “Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system.” 2011. Web. 18 Jan 2021.

Vancouver:

Ångström J. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. [Internet] [Thesis]. Uppsala University; 2011. [cited 2021 Jan 18]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ångström J. Hydrogen absorption/desorption properties of the Sc(AlxNi1-x)2 system. [Thesis]. Uppsala University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159372

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Fan, Yangyang. Alloying Aluminum with Transition Metals.

Degree: PhD, 2015, Worcester Polytechnic Institute

URL: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

► A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably… (more)

Subjects/Keywords: eutectic; Al-Mn; Al-Ni-Mn; Al-Mn-W; Al-Ni; Precipitation hardening. Al-Zr-V

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APA (6^th Edition):

Fan, Y. (2015). Alloying Aluminum with Transition Metals. (Doctoral Dissertation). Worcester Polytechnic Institute. Retrieved from etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

Chicago Manual of Style (16^th Edition):

Fan, Yangyang. “Alloying Aluminum with Transition Metals.” 2015. Doctoral Dissertation, Worcester Polytechnic Institute. Accessed January 18, 2021. etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266.

MLA Handbook (7^th Edition):

Fan, Yangyang. “Alloying Aluminum with Transition Metals.” 2015. Web. 18 Jan 2021.

Vancouver:

Fan Y. Alloying Aluminum with Transition Metals. [Internet] [Doctoral dissertation]. Worcester Polytechnic Institute; 2015. [cited 2021 Jan 18]. Available from: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266.

Council of Science Editors:

Fan Y. Alloying Aluminum with Transition Metals. [Doctoral Dissertation]. Worcester Polytechnic Institute; 2015. Available from: etd-050415-125629 ; https://digitalcommons.wpi.edu/etd-dissertations/266

Universidade Federal de Sergipe

17. Augusto dos Santos Freitas. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.

Degree: 2012, Universidade Federal de Sergipe

URL: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

►

Neste trabalho, aplicamos o modelo de Ising com diluição por sítios ao estudo das propriedades magnéticas de uma rede cúbica de corpo centrado (do inglês,… (more)

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Neste trabalho, aplicamos o modelo de Ising com diluição por sítios ao estudo das propriedades magnéticas de uma rede cúbica de corpo centrado (do inglês, body centered cubic, bcc), cujos sítios podem ser ocupados por spins. Como aplicação desse estudo, traçamos alguns diagramas de fase da liga Fe-Al, com comparações entre o modelo teórico utilizado e dados experimentais e propomos uma interação de troca entre os atomos de Fe, na liga, com dependência ate terceira potência da concentração (q) de atomos de Al, possibilitando um melhor ajuste entre teoria e experimento para o diagrama T-q desta liga. Tomamos como base a tecnica do operador diferencial para expandir as expressoes analıticas que surgem do modelo de Ising diluıdo e descrevemos tal comportamento magnetico por meio de aglomerados com 1 e 2 spins. Um bom acordo entre o modelo teorico proposto e dados experimentais tambem e obtido tanto para a magnetização como função de q quanto para o parametro de rede, r, como função de q, sendo que esta abordagem mostra-se como uma boa alternativa a outras tecnicas analıticas e computacionais utilizadas para o estudo de sistemas magneticos diluıdos. Os resultados analıticos obtidos para a rede bcc foram comparados com a tecnica de Monte Carlo para verificar o grau de aplicabilidade do modelo bem como confirmar a validade dos resultados encontrados analiticamente.

In the present work, we study the magnetic properties in the site diluted two-state Ising model on a body-centered cubic lattice. As an application of this study, we has been obtained the phase diagram for Fe-Al alloys and comparisons between theoretical model and experimental data are made by using the exchange interaction between Fe atoms in the alloy up to the third power dependence on concentration q of Al atoms. We have used the differential operator technique to expand the analytical expressions that arise from the diluted Ising model and describe such behavior by means of magnetic clusters with one and two spins. A good agreement between the theoretical model and experimental data is also obtained for both the magnetization and to the lattice parameter, r as a function of q. In this approach, it is shown as a good alternative to other analytical and computational techniques used for the study of diluted magnetic systems. The analytical results obtained for bcc lattice were compared with the Monte Carlo technique to determine the degree of applicability of the model and confirm the validity of the results obtained analytically.

Advisors/Committee Members: Douglas Ferreira de Albuquerque.

Subjects/Keywords: Ligas Fe-Al; FISICA; Fe-Al alloys

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APA (6^th Edition):

Freitas, A. d. S. (2012). APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. (Thesis). Universidade Federal de Sergipe. Retrieved from http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Freitas, Augusto dos Santos. “APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.” 2012. Thesis, Universidade Federal de Sergipe. Accessed January 18, 2021. http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Freitas, Augusto dos Santos. “APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL.” 2012. Web. 18 Jan 2021.

Vancouver:

Freitas AdS. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. [Internet] [Thesis]. Universidade Federal de Sergipe; 2012. [cited 2021 Jan 18]. Available from: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Freitas AdS. APLICAÇÃO DE CAMPO EFETIVO E DA TÉCNICA DE MONTE CARLO AO ESTUDO DE LIGAS FE-AL. [Thesis]. Universidade Federal de Sergipe; 2012. Available from: http://bdtd.ufs.br/tde_busca/arquivo.php?codArquivo=880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

18. Ling, Yan. FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM .

Degree: 2011, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/12018

► This thesis describes the thermodynamic modeling of the Hf-Re binary system and prediction of the Ni-Hf-Re ternary system. Hafnium and rhenium are both alloying elements… (more)

Subjects/Keywords: thermodynamics; Ni-Hf-Re; hafnium; rhenium; Hf-Re; CALPHAD; first-principles; Ni-based superalloys; modeling

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APA (6^th Edition):

Ling, Y. (2011). FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/12018

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ling, Yan. “FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM .” 2011. Thesis, Penn State University. Accessed January 18, 2021. https://submit-etda.libraries.psu.edu/catalog/12018.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ling, Yan. “FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM .” 2011. Web. 18 Jan 2021.

Vancouver:

Ling Y. FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM . [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Jan 18]. Available from: https://submit-etda.libraries.psu.edu/catalog/12018.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ling Y. FIRST-PRINCIPLES CALCULATIONS AND THERMODYNAMIC MODELING OF THE HF-RE BINARY SYSTEM WITH EXTENSION TO THE HF-NI-RE TERNARY SYSTEM . [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/12018

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Yaqoob, Khurram. Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re.

Degree: Docteur es, Sciences des Matériaux, 2012, Université Paris-Est

URL: http://www.theses.fr/2012PEST1172

► E système Mo-Ni-Re est un sous-système majeur des superalliages à base de Ni conçus pour une utilisation dans les applications à haute température. Compte tenu… (more)

Subjects/Keywords: Mo-Ni-Re; Diagramme de phases; Modélisation thermodynamique; Mo-Ni-Re; Phase diagram; Thermodynamic modeling

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APA (6^th Edition):

Yaqoob, K. (2012). Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2012PEST1172

Chicago Manual of Style (16^th Edition):

Yaqoob, Khurram. “Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re.” 2012. Doctoral Dissertation, Université Paris-Est. Accessed January 18, 2021. http://www.theses.fr/2012PEST1172.

MLA Handbook (7^th Edition):

Yaqoob, Khurram. “Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re.” 2012. Web. 18 Jan 2021.

Vancouver:

Yaqoob K. Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re. [Internet] [Doctoral dissertation]. Université Paris-Est; 2012. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2012PEST1172.

Council of Science Editors:

Yaqoob K. Experimental determination and thermodynamic modelisation of Mo-Ni-Re system : Détermination expérimentale et modélisation thermodynamique du système Mo-Ni-Re. [Doctoral Dissertation]. Université Paris-Est; 2012. Available from: http://www.theses.fr/2012PEST1172

20. Fan, Yangyang. Precipitation Strengthening of Aluminum by Transition Metal Aluminides.

Degree: PhD, 2015, Worcester Polytechnic Institute

URL: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

► A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably… (more)

Subjects/Keywords: Al-Mn; Al-Zr-V; Al-Zr; Al-Ni; Transition Metal; Precipitation hardening

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APA (6^th Edition):

Fan, Y. (2015). Precipitation Strengthening of Aluminum by Transition Metal Aluminides. (Doctoral Dissertation). Worcester Polytechnic Institute. Retrieved from etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

Chicago Manual of Style (16^th Edition):

Fan, Yangyang. “Precipitation Strengthening of Aluminum by Transition Metal Aluminides.” 2015. Doctoral Dissertation, Worcester Polytechnic Institute. Accessed January 18, 2021. etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209.

MLA Handbook (7^th Edition):

Fan, Yangyang. “Precipitation Strengthening of Aluminum by Transition Metal Aluminides.” 2015. Web. 18 Jan 2021.

Vancouver:

Fan Y. Precipitation Strengthening of Aluminum by Transition Metal Aluminides. [Internet] [Doctoral dissertation]. Worcester Polytechnic Institute; 2015. [cited 2021 Jan 18]. Available from: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209.

Council of Science Editors:

Fan Y. Precipitation Strengthening of Aluminum by Transition Metal Aluminides. [Doctoral Dissertation]. Worcester Polytechnic Institute; 2015. Available from: etd-042815-143652 ; https://digitalcommons.wpi.edu/etd-dissertations/209

Brno University of Technology

21. Novotný, David. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/82343

► This bachelor’s thesis deals with the effect of an electron beam remelting on binary mixtures of Fe-Al and Ni-Al, which were deposited by Cold spray.… (more)

Subjects/Keywords: Intermetalické sloučeniny; Fe-Al; Ni-Al; elektronový paprsek; Cold spray; Intermetallic compounds; Fe-Al; Ni-Al; electron beam; Cold spray

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APA (6^th Edition):

Novotný, D. (2019). Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/82343

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Novotný, David. “Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.” 2019. Thesis, Brno University of Technology. Accessed January 18, 2021. http://hdl.handle.net/11012/82343.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Novotný, David. “Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method.” 2019. Web. 18 Jan 2021.

Vancouver:

Novotný D. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11012/82343.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Novotný D. Vliv přetavení elektronovým paprskem na binární směsi deponované metodou cold spray: Effect of electron beam remeltin on binary mixtures deposited by the cold spray method. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/82343

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Purdue University

22. Cherukara, Mathew Joseph. The Kinetics of Ni/Al Reactive Intermetallic Composites.

Degree: PhD, Materials Engineering, 2015, Purdue University

URL: https://docs.lib.purdue.edu/open_access_dissertations/1177

► Molecular dynamics (MD) simulations have been used to study the underlying physics and atomistic mechanisms of the reaction progression in Ni/Al reactive intermetallic composites. Preparation… (more)

Subjects/Keywords: Al; Energetic materials; Molecular dynamics; Ni

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APA (6^th Edition):

Cherukara, M. J. (2015). The Kinetics of Ni/Al Reactive Intermetallic Composites. (Doctoral Dissertation). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_dissertations/1177

Chicago Manual of Style (16^th Edition):

Cherukara, Mathew Joseph. “The Kinetics of Ni/Al Reactive Intermetallic Composites.” 2015. Doctoral Dissertation, Purdue University. Accessed January 18, 2021. https://docs.lib.purdue.edu/open_access_dissertations/1177.

MLA Handbook (7^th Edition):

Cherukara, Mathew Joseph. “The Kinetics of Ni/Al Reactive Intermetallic Composites.” 2015. Web. 18 Jan 2021.

Vancouver:

Cherukara MJ. The Kinetics of Ni/Al Reactive Intermetallic Composites. [Internet] [Doctoral dissertation]. Purdue University; 2015. [cited 2021 Jan 18]. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1177.

Council of Science Editors:

Cherukara MJ. The Kinetics of Ni/Al Reactive Intermetallic Composites. [Doctoral Dissertation]. Purdue University; 2015. Available from: https://docs.lib.purdue.edu/open_access_dissertations/1177

Penn State University

23. Rajsiri, Supphachan. Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14491

► The phase transformations in a Ti-Al-Ru alloy were studied by performing high temperature X-ray diffractions using synchrotron radiation. A Ti-32.4 at% Al-4.1 at% Ru alloy… (more)

▼ The phase transformations in a Ti-Al-Ru alloy were studied by performing high temperature X-ray diffractions using synchrotron radiation. A Ti-32.4 at% Al-4.1 at% Ru alloy was used; it undergoes various phase transformations. Specimens were prepared by arc-melting. The alloy was beta-homogenized at 1300 °C and ice-water quenched. Powdered specimens with particle size equivalent or smaller than 45 micron were prepared, and packed in a quartz capillary. The X-ray measurements were performed during the step-wise heating and cooling between room temperature and 1220 °C. A single beta phase with relatively small amounts of alpha2, G and alpha phases were initially present in the sample. Decomposition of the as-quenched beta phase to the equilibrium phases was investigated as well as the phase relationships among the major phases (beta, alpha2 and G). At an average heating rate of 5.3 °C/min, most of the beta phase decomposed to form the alpha2 and G phases, possibly through eutectoid reaction taking place between 687 °C-709 °C. The gamma phase formed at approximately 917 °C. A reverse eutectoid reaction for the formation of beta phase was observed between 1018 °C and 1220 °C, but was incomplete due to two possible reasons: suspected low diffusion rates in the alpha2 and G phases, and the presence of a relatively large amount of dissolved oxygen, which increases the stability of the alpha2 phase. beta-ordering could not be detected due to the overlap of the beta’ (001) reflection, the most intense superlattice reflection for the beta’ phase, and the Ti5Si3 (020) diffraction peaks. During cooling from 1220 °C to room temperature at an average heating rate of 4.8 °C/min, the beta phase partially decomposed to alpha2 and G phases,but no significant amount of transformation was observed. The (Ti,Al)Ru phase was observed on the X-ray patterns recorded at 1068 °C through 36 °C. The overall reaction rates of the as-quenched Ti-32.4 at% Al-4.1 at% Ru alloy were sluggish. Mathematical expressions for the relationships between lattice parameters and alloy compositions were proposed for the G, beta, and alpha2 phases. It was suspected that the presence of Ru affects the stability of the beta phase. A slight change in Ru content was also detected in the alpha2 and G phases during the phase reactions. Simulated step-wise heating and cooling microstructure contained plate-like alpha2 phase and the G-phase matrix as the product of the beta decomposition between 683 °C and 709 °C. Small alpha2 particles were observed nearby the interface between the plate-like alpha2 phase and the G phase matrix as a result of the beta decomposition during cooling from 1220 °C. Fundamental information for the processing of an alloy similar to this Ti-Al-Ru alloy is proposed: a deformation processing of single beta phase alloys should be done below 680 °C, and any thermal processing above 680 °C should be avoided due to the presence of the brittle G phase. Advisors/Committee Members: Earle Richard Ryba, Dissertation Advisor/Co-Advisor, Earle Richard Ryba, Committee Chair/Co-Chair, Pual R Howell, Committee Member, Todd Palmer, Committee Member, Michael T Lanagan, Committee Member.

Subjects/Keywords: Phase transformation; Ti-Al-Ru alloy; Synchrotron X-ray diffraction

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APA (6^th Edition):

Rajsiri, S. (2012). Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14491

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rajsiri, Supphachan. “Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy.” 2012. Thesis, Penn State University. Accessed January 18, 2021. https://submit-etda.libraries.psu.edu/catalog/14491.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rajsiri, Supphachan. “Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy.” 2012. Web. 18 Jan 2021.

Vancouver:

Rajsiri S. Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Jan 18]. Available from: https://submit-etda.libraries.psu.edu/catalog/14491.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rajsiri S. Phase transformations during continuous heating and cooling in a Ti-Al-Ru alloy. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/14491

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of St. Andrews

24. Obrecht, Lorenz. Artificial metalloenzymes in catalysis .

Degree: 2015, University of St. Andrews

URL: http://hdl.handle.net/10023/7248

► This thesis describes the synthesis, characterisation and application of artificial metalloenzymes as catalysts. The focus was on two mutants of SCP-2L (SCP-2L A100C and SCP-2L… (more)

▼ This thesis describes the synthesis, characterisation and application of artificial metalloenzymes as catalysts. The focus was on two mutants of SCP-2L (SCP-2L A100C and SCP-2L V83C) both of which possess a hydrophobic tunnel in which apolar substrates can accumulate. The crystal structure of SCP-2L A100C was determined and discussed with a special emphasis on its hydrophobic tunnel. The SCP-2L mutants were covalently modified at their unique cysteine with two different N-ligands (phenanthroline or dipicolylamine based) or three different phosphine ligands (all based on triphenylphosphine) in order to increase their binding capabilities towards metals. The metal binding capabilities of these artificial proteins towards different transition metals was determined. Phenanthroline modified SCP-2L was found to be a promising scaffold for Pd(II)-, Cu(II)-, Ni(II)- and Co(II)-enzymes while dipicolylamine-modified SCP-2L was found to be a promising scaffold for Pd(II)-enzymes. The rhodium binding capacity of two additional phosphine modified protein scaffolds was also investigated. Promising scaffolds for Rh(I)- and Ir(I)-enzymes were identified. Rh-enzymes of the phosphine modified proteins were tested in the aqueous-organic biphasic hydroformylation of linear long chain 1-alkenes and compared to the Rh/TPPTS reference system. Some Rh-enzymes were found to be several orders of magnitude more active than the model system while yielding comparable selectivities. The reason for this remarkable reactivity increase could not be fully elucidated but several potential modes of action could be excluded. Cu-, Co-, and Ni-enzymes of N-ligand modified SCP-2L A100C were tested in the asymmetric Diels-Alder reaction between cyclopentadiene and trans-azachalcone. A promising 29% ee for the exo-product was found for the phenanthroline modified protein in the presence of nickel. Further improvement of these catalyst systems by chemical means (e.g. optimisation of ligand structure) and bio-molecular tools (e.g. optimisation of protein environment) can lead to even more active and (enantio)selective catalysts in the future. Advisors/Committee Members: Kamer, Paul (Paul C. J.) (advisor).

Subjects/Keywords: Artificial metalloenzymes; Artificial enzymes; Catalysis; Enantioselective; Hydroformylation; Diels-Alder; Rh-enzyme; Ni-enzyme; Pd-enzyme; Pt-enzyme; Zn-enzyme; Mn-enzyme; Fe-enzyme; Cu-enzyme; Co-enzyme; Ru-enzyme; Re-enzyme; Ir-enzyme; Aqueous-organic biphasic hydroformylation; Hydroformylation of long chain 1-alkene; Phosphine bearing enzymes; Nitrogen-ligand bearing enzymes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Obrecht, L. (2015). Artificial metalloenzymes in catalysis . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/7248

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Obrecht, Lorenz. “Artificial metalloenzymes in catalysis .” 2015. Thesis, University of St. Andrews. Accessed January 18, 2021. http://hdl.handle.net/10023/7248.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Obrecht, Lorenz. “Artificial metalloenzymes in catalysis .” 2015. Web. 18 Jan 2021.

Vancouver:

Obrecht L. Artificial metalloenzymes in catalysis . [Internet] [Thesis]. University of St. Andrews; 2015. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/10023/7248.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Obrecht L. Artificial metalloenzymes in catalysis . [Thesis]. University of St. Andrews; 2015. Available from: http://hdl.handle.net/10023/7248

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

25. Divya, V D. Diffusion Studies On Systems Related to Nickel Based Superalloys.

Degree: PhD, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1948

► Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys… (more)

▼ Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys has been modified continuously to improve the properties. The addition of Pt improves oxidation resistance without compromising the mechanical properties of the superalloys. To further enhance the performance of the superalloy components, various coatings are applied on them. The-(NiPt)Al intermetallic compound bond coats, which are presently utilized, have certain drawbacks. Diffusion of Al from the bond coat to superalloy during service leads to accumulation of stress near the bond coat. The refractory elements present in superalloy precipitate as topological close packed (TCP) phases in the interdiffusion zone. Consequently, a Pt enriched γ(Ni) + γ’(Ni3Al) phase mixture has been proposed as a possible alternative since TCP phases do not form in the interdiffusion zone. In this thesis, diffusion studies are performed on several binary and ternary systems with the primary purpose of understanding the effect of Pt in Ni based superalloys and also in γ + γ’ phase mixture bond coats. Further, a detailed interdiffusion study is conducted in Mo- and W- based binary and ternary systems to understand the growth of the TCP phases. By performing bulk and multifoil diffusion couple experiments, different diffusion parameters like, inter, intrinsic, tracer, impurity diffusion coefficients and activation energy that are necessary to understand the diffusion mechanism are determined. Additionally using the nanoindentation technique on diffusion couples, variation of mechanical properties such as, hardness and modulus with composition is studied. First, interdiffusion in Ni-Pt, Co-Pt, Co-Ni, Ni-Fe and Co-Fe binary systems is examined. In Ni-Pt and Co-Pt, experimental results show that Pt is the slower diffusing species at all compositions. In both the systems, driving force is found to be the reason for higher values of intrinsic diffusion coefficients observed in the range of 40-60 at. % Pt. Contribution of vacancy wind effect on diffusion parameters is found to be negligible. It is found from the multifoil diffusion couple experiments that Ni is the faster diffusing species in the Co-Ni system. Bulk diffusion couple experiments are conducted in the Co-Ni-Pt and Co-Ni-Fe systems, by coupling binary alloys with the third element. Uphill diffusion is observed for Co and Ni in Pt rich corner of the Co-Ni-Pt system. Main and cross interdiffusion coefficients are calculated at the compositions where two diffusion profiles intersect. In both the systems, the main interdiffusion coefficients are positive over the whole composition range and the cross diffusion coefficients show both positive and negative values at different regions. Hardness measured by performing the nanoindentations on diffusion couples of both the systems, shows the higher values at intermediate compositions. The effect of Pt in and’ phases of Ni-Al… Advisors/Committee Members: Paul, Aloke (advisor), Ramamurty, U (advisor).

Subjects/Keywords: Nickel Based Superalloys; Superalloys; Co-Ni System; Ni-Al-Pt Ternary System; Co-Ni-Mo System; Co-Ni-W Systems; Ni-Pt Systems; Co-Pt Systems; Ni-Mo System; Co-Mo System; Ni-Pt-Al System; Ni-Co-Pt Systems; Ni-Co-Fe Ternary Systems; Metallurgy

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APA (6^th Edition):

Divya, V. D. (2013). Diffusion Studies On Systems Related to Nickel Based Superalloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1948

Chicago Manual of Style (16^th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2013. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/1948.

MLA Handbook (7^th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2013. Web. 18 Jan 2021.

Vancouver:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2013. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/1948.

Council of Science Editors:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Doctoral Dissertation]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/1948

26. Zhang, Baicheng. Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy.

Degree: Docteur es, Mécanique, 2013, Belfort-Montbéliard

URL: http://www.theses.fr/2013BELF0198

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Au cours de la dernière décennie, le procédé de fabrication additive par fusion sélective d'un lit de poudre SLM a attiré une grande attention dans… (more)

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Au cours de la dernière décennie, le procédé de fabrication additive par fusion sélective d'un lit de poudre SLM a attiré une grande attention dans le domaine de l'industrie, car il permet de produire rapidement des pièces de formes complexes. Le but de ce travail est d'étendre les performances des procédés SLM en étudiant la possibilité d'élaborer des pièces en atmosphère raréfiée. Pour atteindre cet objectif, une approche théorique et expérimentale a été développée, avec la mise en place d'une machine de fusion sélective par laser capable de travailler dans le domaine de pression de 1 à 10-2 mbar.Le travail sous vide permet d'éviter la formation du "bouclier" de plasma généré à partir de l'atmosphère de gaz ionisé par l'énergie du laser. Ceci permet d'une part d'éviter la contamination chimique du matériau (oxydation, nitruration,...) au cours des processus de fusion et d'autre part de réduire le taux de porosité. L'effet des paramètres du laser et des variables d'environnement sur la qualité de pièces a été étudié en considérant le cas du fer pur, de l'acier Inox 316L et du titane.Par ailleurs nous avons étudié la possibilité d'obtenir des alliages in-situ au cours de la fabrication par la technique SLM à partir de mélanges de poudres.Des essais ont été conduits à partir de mélanges Mg/Al, Fe/Ni et Ti/Ni. Dans tous les cas nous avons pu obtenir des alliages in-situ pour les domaines de composition visés qui correspondent à des applications pratiques (structures légères, alliage magnétique à faible coercivité, alliage à mémoire de forme). Les propriétés des matériaux obtenus, d'après les premières caractérisations effectuées, se comparent de façon favorable par rapport aux techniques classiques d'élaboration et de mise en œuvre.

During the last decade, selective laser melting attracted attention in industry because it could allow producing parts with complex shapes rapidly and accurately. The aim of this work is to obtain parts with desired properties by SLM technology. To achieve this point, a theoretical and experimental approach was developed concerning a new process which carries out the selective laser melting process at pressures in the range 1 to 1×10-2 mbar.Vacuum operating under allows avoiding the plasma shield generated from the gas atmosphere ionized by the high laser energy, which on the one hand avoids the chemical contamination (oxidizing, nitriding…) during the melting process and on the other hand reduces the porosity rate. The effect of laser parameters and environment variables on the quality of parts was studied by considering the case of pure iron, stainless steel 316L and titanium.Moreover, we studied the possibility of obtaining in-situ alloys during the SLM manufacturing technique from mixtures of powders.Tests were conducted from mixtures Mg/Al, Fe/Ni and Ti/Ni. In all cases we were able to obtain in-situ alloys for areas covered composition corresponding to practical applications (lightweight structures, low coercivity magnetic alloy, shape memory alloy). The properties of material…

Advisors/Committee Members: Coddet, Christian (thesis director).

Subjects/Keywords: Fusion sélective par laser; Titane; SLM sous vide; Mélange de poudres; Mg-Al; Fe-Ni; Ti-Ni; SLM under vacuum; Mixed powder; Mg-Al; Fe-Ni; Ti-Ni

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, B. (2013). Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy. (Doctoral Dissertation). Belfort-Montbéliard. Retrieved from http://www.theses.fr/2013BELF0198

Chicago Manual of Style (16^th Edition):

Zhang, Baicheng. “Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy.” 2013. Doctoral Dissertation, Belfort-Montbéliard. Accessed January 18, 2021. http://www.theses.fr/2013BELF0198.

MLA Handbook (7^th Edition):

Zhang, Baicheng. “Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy.” 2013. Web. 18 Jan 2021.

Vancouver:

Zhang B. Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy. [Internet] [Doctoral dissertation]. Belfort-Montbéliard; 2013. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2013BELF0198.

Council of Science Editors:

Zhang B. Fusion sélective par laser - influence de l'atmosphère et réalisation d'alliage in situ : Selective laser melting - influence of atmosphere and realization of in-situ fonction alloy. [Doctoral Dissertation]. Belfort-Montbéliard; 2013. Available from: http://www.theses.fr/2013BELF0198

Indian Institute of Science

27. Narayanan, P Ramesh. A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications.

Degree: PhD, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1999

► Aluminium alloys, which are the most widely used materials in the aircraft and aerospace industries, find their applications due to high strength–to-density ratio, resistance to… (more)

▼ Aluminium alloys, which are the most widely used materials in the aircraft and aerospace industries, find their applications due to high strength–to-density ratio, resistance to catastrophic fracture, high degree of toughness, fabricability including good weldability and availability. High strength aluminum alloys are used in different forms like sheets, forgings and extruded rods, welded and machined components in the aerospace industry. One major application of the aluminium alloys in the space sector is in the launch vehicle and satellite sub-systems. The Indian Space Research Organization has met major challenges of indigenization of suitable aluminium alloys, for example, Al-Cu alloys (like AA2219) and Al–Zn-Mg alloys (like AA7075 and AFNOR 7020). Many failures of the metallic sub-systems made of different grades of aluminum alloys have confirmed that high levels of residual stresses and unacceptable microstructures have played a role. Crystallographic texture in these materials has a very significant role to play in the performance of these materials in service. The anisotropy in the mechanical properties caused by crystallographic texture would add to the woes of the existing problems of residual stresses and directionality in the microstructure. In this context, a detailed study of crystallographic texture and residual stresses of high strength aluminium alloys is mandatory. It is also important to study the influence of texture on the anisotropy in mechanical properties. The present research programme aims at addressing some of these aspects. The entire work has been divided in three major sections, namely macro and micro texture analysis, non-destructive measurement of residual stresses using X-ray Diffraction (XRD) and the Ultrasonic Testing (UST) and the study of anisotropy in the mechanical properties arising due to the above two factors. The thesis composition is as follows. In Chapter I, a detailed survey of the literature has been presented wherein basic physical metallurgy for different aluminum alloys of interest has been given. Thereafter, details of texture measurement by the X-ray diffraction and Electron Back Scatter Diffraction (EBSD) are presented. This is followed by a detailed review on the texture studies carried out in aluminium alloys under various conditions. Literature review on the two non-destructive methods, namely the X-ray diffraction and ultrasonic method has been carried out in detail. In order to account for microstructural changes, Differential Scanning Calorimetry (DSC) was carried out. Recent work on the mechanical property anisotropy arising due to high degree of mechanical working in aluminium alloys has been reviewed. Chapter II includes the experimental details involved in the course of the present investigation. The procedural details of cold rolling and associated microstructural changes are given in this chapter. This is followed by the texture measurement methods. Experimental details of the bulk texture measurement using the X-ray diffraction and micro texture… Advisors/Committee Members: Ranganathan, S (advisor), Suwas, Satyam (advisor).

Subjects/Keywords: Aluminium Alloys; Crystallography; Aluminium Alloys - Mechanical Properties; Aluminium Alloys - Residual Stresses; Aluminium Alloys - Texture; Aluminium Alloys - Physical Metallurgy; Alluminium Alloys - Space Applications; Aluminium Alloys - Crystallographic Structure; AA2219 Al Alloy; AFNOR7020 Al Alloy; Al-Zn-Mg Alloys; Al Alloys; AA2219 Aluminium Alloys; Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Narayanan, P. R. (2013). A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1999

Chicago Manual of Style (16^th Edition):

Narayanan, P Ramesh. “A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications.” 2013. Doctoral Dissertation, Indian Institute of Science. Accessed January 18, 2021. http://etd.iisc.ac.in/handle/2005/1999.

MLA Handbook (7^th Edition):

Narayanan, P Ramesh. “A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications.” 2013. Web. 18 Jan 2021.

Vancouver:

Narayanan PR. A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2013. [cited 2021 Jan 18]. Available from: http://etd.iisc.ac.in/handle/2005/1999.

Council of Science Editors:

Narayanan PR. A Study Of Crystallographic Texture, Residual Stresses And Mechanical Property Anisotropy In Aluminium Alloys For Space Applications. [Doctoral Dissertation]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/1999

Texas A&M University

28. Thawabi, Hassan S. Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys.

Degree: MS, Mechanical Engineering, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149454

► Ferromagnetic shape memory alloys FSMAs have diverse application, especially in the aerospace and bio-medical industries. They are a class of active and smart materials exhibiting… (more)

Subjects/Keywords: Ab initio; First principles; DFT; electronic structure; phase transformations; Co-Ni-Al; Co-Ni-Ga

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Thawabi, H. S. (2013). Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149454

Chicago Manual of Style (16^th Edition):

Thawabi, Hassan S. “Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys.” 2013. Masters Thesis, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/149454.

MLA Handbook (7^th Edition):

Thawabi, Hassan S. “Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys.” 2013. Web. 18 Jan 2021.

Vancouver:

Thawabi HS. Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/149454.

Council of Science Editors:

Thawabi HS. Ab-initio First Principle Modeling of Structural and Magnetic Phase Transformations in Co-Ni-Al Based Shape Memory Alloys. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149454

Université de Grenoble

29. Crozet, Coraline. Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools.

Degree: Docteur es, Génie civil, 2011, Université de Grenoble

URL: http://www.theses.fr/2011GRENI015

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Ce travail a pour but l’acquisition de connaissances fondamentales dans les équilibres de phases et les transformations de phases des alliages ternaires contenant du fer,… (more)

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Ce travail a pour but l’acquisition de connaissances fondamentales dans les équilibres de phases et les transformations de phases des alliages ternaires contenant du fer, du nickel et du cuivre.Cette étude est composée de trois parties : la première est consacrée aux équilibres de phase entre600°C et 1000°C dans le coin riche en fer du système ternaire Cu-Fe-Ni, la seconde concerne l’analyse des transformations de phases dans des alliages modèles suivant deux vitesses de refroidissement et la troisième étudie les alliages industriels.Cette approche expérimentale est appuyée par des calculs thermodynamiques. Une comparaison est effectuée avec les données issues de la littérature. Les sections isothermes à 600°C, 800°C et1000°C ont été reconfirmées. Les domaines triphasés αFe/γFe/γCu ont été déterminés à 600°C et800°C et semblent décalés vers de plus fortes teneurs en Ni. La lacune de miscibilité est moins étendue que celle calculée et ce particulièrement du côté du binaire Cu-Ni.Les transformations de phase γ→α apparaissant lors du refroidissement d’alliages Fe-xCu-10Ni et Fe-10Cu-xNi (0<x<15 % en masse) ont été étudiées. Elles sont observées dans tous les alliages refroidis lentement par dilatométrie sauf dans l’alliage binaire Fe-Cu. Les températures de transformation sont systématiquement inférieures aux températures d’équilibre et cet écart augmente lorsque les teneurs en Ni et Cu augmentent. La formation de la ferrite bainitique est favorisée par l’addition de Cu dans les alliages trempés Fe-xCu-10Ni et par l’addition de Ni dans les alliages Fe-10Cu-xNi tandis que la ferrite massive se forme préférentiellement lors du refroidissement lent. Une diminution des températures de transformation se produit lorsque la taille de grains est affinée et est reliée au processus d’accommodation plastique liée à la transformation.La composition et la vitesse de refroidissement jouent un rôle sur la dureté de ces alliages via la présence de Ni en solution solide ainsi que le nombre et la taille des précipités de Cu.

This work aims in getting fundamental knowledge of phase equilibria and microstructures of ternary alloys containing copper, nickel and iron. The thesis is composed of three parts: a first part is devoted to phase equilibria in the Fe-rich corner of the ternary Cu-Fe-Ni system between 600°C and 1000°C, a second part is devoted to the microstructures in these materials for model alloys, for two cooling rates and a third part is devoted to industrial alloys.Phase equilibria of the system are investigated in the range 600-1000°C using diffusion multiples in conjunction with selected equilibrated alloys. This experimental approach is supplemented by thermodynamic calculations. A comparison is drawn with data reported in the literature. The isothermal sections at 600°C, 800°C and 1000°C have been reconfirmed. The three-phase regions αFe/γFe/γCu are determined at 600°C and 800°C and appear shifted to a higher Ni content. The miscibility gap is narrower than the calculated, particularly on the Cu-Ni binary…

Advisors/Committee Members: Lay, Dietrich-Sabine (thesis director), Antoni-Zdziobek, Annie (thesis director).

Subjects/Keywords: Thermodynamique; Transformation de phase; Alliages Fe-Ni-Cu; Thermodynamic; Phase transformations; Fe-Ni-Cu alloys

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Crozet, C. (2011). Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENI015

Chicago Manual of Style (16^th Edition):

Crozet, Coraline. “Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed January 18, 2021. http://www.theses.fr/2011GRENI015.

MLA Handbook (7^th Edition):

Crozet, Coraline. “Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools.” 2011. Web. 18 Jan 2021.

Vancouver:

Crozet C. Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2021 Jan 18]. Available from: http://www.theses.fr/2011GRENI015.

Council of Science Editors:

Crozet C. Equilibres de phases et microstructures d'alliages CU-FE-NI riches en FE : Design of a new iron-nickel-copper binder for diamond tools. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENI015

30. Joseph, Fernandus M. Investigations on diffusion bonding of dissimilar materials; -.

Degree: Mechanical Engineering, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/22088

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Magnesium Mg and Aluminium Al alloys have good features such as low newlineDensity good damping characteristics dimensional stability machinability and low newlinecasting costs and hence… (more)

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Magnesium Mg and Aluminium Al alloys have good features such as low newlineDensity good damping characteristics dimensional stability machinability and low newlinecasting costs and hence have of late begun to attract greater attention in academic newlineresearch and industrial applications The research and application of Mg and Al alloys newlinehave been extended from navigation and military fields to civil products of high newlineadditional value such as automobile computer and communication equipment Mg and newlineAl alloys would achieve weight reduction and high efficiency of production if used as newlinesubstitutes for steel The principal difficulty when joining magnesium Mg and aluminium Allies in the existence of formation of oxide films and brittle intermetallic in the bond region However diffusion bonding can be used to join these alloys without much difficulty This thesis presents the procedures involved in constructing the diffusion bondingwindows such as TemperatureTime and Pressure Time diagrams for effective diffusionbonding of aluminium alloy and magnesium alloys The developed processing windowscan be used as reference maps to the design and welding engineers for selectingappropriate diffusion bonding parameters to get good quality bonds for Al and Mgalloys Empirical relationships were developed to predict the lap shear strength and newlinebonding strength of diffusion bonded joints of aluminium alloy AA6061 and newlinemagnesium alloys AZ31B AZ61A AZ80 incorporating diffusion bonding parameters newlinesuch as bonding temperature bonding pressure holding time and surface roughness of newlinethe materials to be joined Response surface methodology RSM was applied to newlinevi optimize the diffusion bonding parameters to attain the maximum shear strength and newlinebonding strength of the joint The relationships between the optimum process newlineparameters and the percentage of aluminium and zinc in magnesium alloys were newlineestablished The optimum process parameters can be evaluated by varying the percentage of aluminium in magnesium alloys The effect of process parameters such as bonding temperature bonding pressure holding time and surface roughness on shear strength bonding strength diffusion layer thickness and interface hardness were newlineanalyzed Optical Microscopy OM Scanning Electron Microscopy SEM Electron newlineDispersive Spectrum EDS and X ray Diffraction XRD techniques were used to newlinecharacterize the joints Nearly 100 dissimilar AZ31B Mg AA6061 Al AZ61A newlineMgAA6061 Al and AZ80 Mg AA6061 Al joints were prepared using diffusion newlinebonding process newline newline

Reference p.161-168

Advisors/Committee Members: Senthilkumar, T.

Subjects/Keywords: Aluminium Al alloys; diffusion bonding; dissimilar materials

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Joseph, F. M. (2014). Investigations on diffusion bonding of dissimilar materials; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/22088

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Joseph, Fernandus M. “Investigations on diffusion bonding of dissimilar materials; -.” 2014. Thesis, Anna University. Accessed January 18, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/22088.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Joseph, Fernandus M. “Investigations on diffusion bonding of dissimilar materials; -.” 2014. Web. 18 Jan 2021.

Vancouver:

Joseph FM. Investigations on diffusion bonding of dissimilar materials; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/22088.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Joseph FM. Investigations on diffusion bonding of dissimilar materials; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/22088

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations