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Titolo:
Thermodynamic calculation of phase equilibria in the Ti-Co and Ni-Sn systems
Autore:
Nash, P; Choo, H; Schwarz, RB;
Indirizzi:
IIT, Mech Mat & Aerosp Engn Dept, Chicago, IL 60616 USA IIT Chicago IL USA 60616 ch Mat & Aerosp Engn Dept, Chicago, IL 60616 USA Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA
Titolo Testata:
JOURNAL OF MATERIALS SCIENCE
fascicolo: 20, volume: 33, anno: 1998,
pagine: 4929 - 4936
SICI:
0022-2461(19981015)33:20<4929:TCOPEI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMORPHOUS-ALLOYS; STABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Nash, P IIT, Mech Mat & Aerosp Engn Dept, Chicago, IL 60616 USA IIT Chicago IL USA 60616 Aerosp Engn Dept, Chicago, IL 60616 USA
Citazione:
P. Nash et al., "Thermodynamic calculation of phase equilibria in the Ti-Co and Ni-Sn systems", J MATER SCI, 33(20), 1998, pp. 4929-4936

Abstract

A thermodynamic model for the titanium-cobalt system has been developed utilizing measured enthalpies of mixing of the liquid and evaluated phase-diagram data. The free energies of the liquid, bcc, fee, and hcp solid solutions, and TiCo, Ti2Co, TiCo2, and TiCo3 compounds were calculated for a temperature of 400 K. The model and measured heats of crystallization have been used to predict the free energy of the metastable amorphous phase at 400 K,needed for comparison with experimental results on the mechanical alloyingof Ti and Co. The predicted glass-forming range for alloys prepared by mechanical alloying is from 10 to 81.5 at. % Co. We adopted a similar approachfor modeling the Ni-Sn system to calculate the free energies of Ni3Sn, andNi3Sn2, and the liquid (amorphous) and fee solid solutions in the nickel-rich region at 240 K. In this system the inclusion of the magnetic contribution to the free energy of the Ni-rich fee solid solution is important in interpreting the results of mechanical alloying. We propose a simple transformation of the free-energy curves, which assists in the graphical identification of the glass-forming ranges. (C) 1998 Kluwer Academic Publishers.

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Documento generato il 02/10/20 alle ore 01:26:34