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You searched for subject:(Co Mo System). Showing records 1 – 3 of 3 total matches.

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Indian Institute of Science

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

Degree: 2011, Indian Institute of Science

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, Ramamurty, U.

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

APA (6th Edition):

Divya, V. D. (2011). Diffusion Studies On Systems Related to Nickel Based Superalloys. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1948

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

Chicago Manual of Style (16th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2011. Thesis, Indian Institute of Science. Accessed December 16, 2019. http://hdl.handle.net/2005/1948.

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

MLA Handbook (7th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2011. Web. 16 Dec 2019.

Vancouver:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 16]. Available from: http://hdl.handle.net/2005/1948.

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

Council of Science Editors:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Thesis]. Indian Institute of Science; 2011. Available from: http://hdl.handle.net/2005/1948

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


Indian Institute of Science

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

Degree: 2011, Indian Institute of Science

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, Ramamurty, U.

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

APA (6th Edition):

Divya, V. D. (2011). Diffusion Studies On Systems Related to Nickel Based Superalloys. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/1948 ; http://etd.ncsi.iisc.ernet.in/abstracts/2522/G24871-Abs.pdf

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

Chicago Manual of Style (16th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2011. Thesis, Indian Institute of Science. Accessed December 16, 2019. http://etd.iisc.ernet.in/handle/2005/1948 ; http://etd.ncsi.iisc.ernet.in/abstracts/2522/G24871-Abs.pdf.

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

MLA Handbook (7th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2011. Web. 16 Dec 2019.

Vancouver:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 16]. Available from: http://etd.iisc.ernet.in/handle/2005/1948 ; http://etd.ncsi.iisc.ernet.in/abstracts/2522/G24871-Abs.pdf.

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

Council of Science Editors:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ernet.in/handle/2005/1948 ; http://etd.ncsi.iisc.ernet.in/abstracts/2522/G24871-Abs.pdf

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


KTH

3. Lu, YiYao. Theoretical and Experimental Study of the Co-Cr-Mo System.

Degree: Materials Science and Engineering, 2011, KTH

The thermodynamic properties of the Co-Cr-Mo ternary system have been described. Available experimental data on the system have been assessed and applied to optimize the parameters used in the thermodynamic models within the Calphad method. Meanwhile, samples were made by the powder metallurgical process and heat treated (sintered) at 1573 K to investigate the phase diagram data related to the intermetallic phases, such as σ, μ and R phases present in the system. With the optimized thermodynamic description, we are able to fit most of the experimental data in the literature and from this work. However, the one phase field of R is too narrow in the present description. Furthermore, at 1573 K the extension of the phase boundary of σ toward the Co corner needs to be improved. In addition, the calculated phase diagram at 1573 K shows a fcc-bcc-σ three-phase equilibrium near the Co-Cr binary side. This is not shown in the experimentally determined ternary phase diagram but is necessary in order to match the recent data on the Co-Cr binary system.

Subjects/Keywords: Co-Cr-Mo system; Calphad method; Thermodynamic description

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

APA (6th Edition):

Lu, Y. (2011). Theoretical and Experimental Study of the Co-Cr-Mo System. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42584

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

Chicago Manual of Style (16th Edition):

Lu, YiYao. “Theoretical and Experimental Study of the Co-Cr-Mo System.” 2011. Thesis, KTH. Accessed December 16, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42584.

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

MLA Handbook (7th Edition):

Lu, YiYao. “Theoretical and Experimental Study of the Co-Cr-Mo System.” 2011. Web. 16 Dec 2019.

Vancouver:

Lu Y. Theoretical and Experimental Study of the Co-Cr-Mo System. [Internet] [Thesis]. KTH; 2011. [cited 2019 Dec 16]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42584.

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

Council of Science Editors:

Lu Y. Theoretical and Experimental Study of the Co-Cr-Mo System. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42584

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

.