Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 17    No. 6    December 2007

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Application of phase diagram calculations to development of new ultra-high temperature structural materials
YANG Ying(杨 莹)1, B.P. Bewlay2, CHEN Shuang-lin(陈双林)1, Y.A. Chang3

1. CompuTherm LLC, Madison, Wisconsin 53719, USA; 2. General Electric Global Research, Schenectady, New York 12301, USA; 3. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA

Abstract:In-situ refractory metal intermetallic composites(RMICs) based either on (Nb, Si) or (Mo, Si, B) are candidate materials for ultra-high temperature applications (>1 400 ℃). To provide a balance of mechanical and environmental properties, Nb-Si composites are typically alloyed with Ti and Cr, and Mo-Si-B composites are alloyed with Ti. Phase diagrams of Nb-Cr-Ti-Si and Mo-Si-B-Ti, as prerequisite knowledge for advanced materials design and processing development, are critically needed. The phase diagrams in the metal-rich regions of multicomponent Nb-Cr-Ti-Si and Mo-Si-B-Ti were rapidly established using the Calphad (Calculation of phase diagram) approach coupled with key experiments. The calculated isotherms, isopleths, and solidification paths were validated by experimental work. The important heterogeneous multiphase equilibria in both quaternary systems identified will offer engineers the opportunity to develop materials with a balance of properties for high-temperature applications.

 

Key words: intermetallics, phase diagram calculation; Mo-Si-B-Ti; Nb-Cr-Si-Ti; high temperature structural materials

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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