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1. Zdujić Miodrag. Structural and thermal characteristics of mechanochemically treated metal powders.

Degree: PhD, Technology and Metallurgy, 1996, University of Belgrade

In this study the formation of non-equilibrium structures in metals by mechanochemical treatment has been investigated. The structural and thermal properties of powders mechanochemically treated for various milling times have been studied by X-ray diffraction, differential scanning calorimetry, differential thermal analysis, as well as scanning and transmission electron microscopy. The experimental results were discussed from kinetic and thermodynamic point of view. Mechanochemical treatment, i.e. mechanical alloying of mixture of aluminium and molybdenum powders of various starting compositions (Al-O, 3, 10, 17, 20, 27, 50, 75 and 100 at.%Mo) was performed in a horizontal ball mill. In all cases milling produced nanocrystalline or/and amorphous structures. During subsequent heat treatment such metastable products easily react leading to the formation of intermetallic phases: Al12Mo, Al5Mo, Al4Mo, Al8Mo3 and AlMo3. Mixture of nickel and molybdenum powders (Ni-50 at.%Mo) was treated in various types of mills. Mechanical alloying in the horizontal ball mill yields an amorphous phase while in planetary and vibrating ball mill a disordered intermetallic compound was produced as a result of greater milling energies. The formation of amorphous phase in both systems is similar and occurs in four stages: (i) formation of very fine composite powders, (ii) formation of solid solution either Al(Mo) or Ni(Mo), (iii) collapse of supersaturated solid solution into the amorphous phase and (iv) gradual dissolution of residual molybdenum crystallites into the amorphous matrix.

U ovom radu je ispitivano dobijanje neravnotežnin struktura u metalima mehanohemijskim tretmanom. Strukturne i termijske karakteristike prahova mehanohemijski tretiranih različito vreme mlevenja su ispitivane rendgenskom strukturnom analizom, diferencijalnom skanirajućom kalorimetrijom, diferencijalnom termijskom analizom, kao i skanirajućom i transmisionom elektronskom mikroskopijom. Eksperimentalni rezultati su diskutovani sa kinetičkog i termodinamičkog stanovišta. Mehanohemijski tretmani, tj. mehaničko legiranje smeša čistih prahova aluminijuma i molibdena različitih početnih sastava (Al-0, 3, 10, 17, 20, 27, 50, 75 i 100 at.%Mo) su rađeni u horizontalnom kugličnom mlinu. U svim slučajevima mlevenje proizvodi nanokristalnu i/ili amorfnu strukturu. Tokom naknadnog termijskog tretmana, ovakvi metastabilni proizvodi lako reaguju obrazujući intermetalna jedinjenja: Al12Mo, Al5Mo, Al4Mo, AlgMo3 i AlMo3. Smesa prahova nikla i molibdena (Ni-50 at.%Mo) je mlevena u različitim tipovima mlinova. Mehaničkim legiranjem u horizontalnom kugličnom mlinu dobija se amorfna faza. U planetarnom i vibracionom mlinu, zbog veće energije mlevenja, dobija se neuređeno intermetalno jedinjenje. Mehanohemijska reakcija amortizacije u oba ispitivana sistema je slična i odvija se u četiri stupnja: (i) obrazovanje veoma finog kompozitnog praha, (ii) obrazovanje čvrstog rastvora Al(Mo) ili Ni(Mo), (iii) transformacija presićenog čvrstog rastvora u amorfnu fazu i (iv) postepeno…

Subjects/Keywords: Mechanochemical treatment; mechanical alloying; milling; solid state reactions; nanocrystalline materials; amorphous phase; Al-Mo system; Ni-Mo system; intermetallics; metastable structures; Mehanohemijski tretman; mehaničko legiranje; mlevenje; reakcije u čvrstom stanju; nanokristalni materijali; amorfna faza; sistem Al-Mo; sistem Ni-Mo; intermetalna jedinjenja; metastabilne strukture

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APA (6th Edition):

Miodrag, Z. (1996). Structural and thermal characteristics of mechanochemically treated metal powders. (Doctoral Dissertation). University of Belgrade. Retrieved from http://dx.doi.org/10.2298/BG19960424ZDUJIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=492 ; https://fedorabg.bg.ac.rs/fedora/get/o:6428/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=13423119

Chicago Manual of Style (16th Edition):

Miodrag, Zdujić. “Structural and thermal characteristics of mechanochemically treated metal powders.” 1996. Doctoral Dissertation, University of Belgrade. Accessed December 12, 2019. http://dx.doi.org/10.2298/BG19960424ZDUJIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=492 ; https://fedorabg.bg.ac.rs/fedora/get/o:6428/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=13423119.

MLA Handbook (7th Edition):

Miodrag, Zdujić. “Structural and thermal characteristics of mechanochemically treated metal powders.” 1996. Web. 12 Dec 2019.

Vancouver:

Miodrag Z. Structural and thermal characteristics of mechanochemically treated metal powders. [Internet] [Doctoral dissertation]. University of Belgrade; 1996. [cited 2019 Dec 12]. Available from: http://dx.doi.org/10.2298/BG19960424ZDUJIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=492 ; https://fedorabg.bg.ac.rs/fedora/get/o:6428/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=13423119.

Council of Science Editors:

Miodrag Z. Structural and thermal characteristics of mechanochemically treated metal powders. [Doctoral Dissertation]. University of Belgrade; 1996. Available from: http://dx.doi.org/10.2298/BG19960424ZDUJIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=492 ; https://fedorabg.bg.ac.rs/fedora/get/o:6428/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=13423119

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