Application of phase diagram calculations to development of new ultra-high temperature structural materials

摘要：

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.

关键词： intermetallics, phase diagram calculation Mo-Si-B-Ti Nb-Cr-Si-Ti high temperature structural materials

作者: YANG Ying B.P.Bewlay CHEN Shuang-lin Y.A.Chang

作者单位: CompuTherm LLC,Madison,Wisconsin 53719,USA General Electric Global Research,Schenectady,New York 12301,USA Department of Materials Science and Engineering,University of Wisconsin-Madison,Madison,Wisconsin 53

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）