Microstructure Refinement and Improvement of Mechanical Properties of as-cast TiAl Based Intermetallics with Yttrium and Boron Addition

摘要：

The influence of boron (B) and rare earth metal yttrium(Y) on microstructure and mechanical properties or as-cast Y-modified TiAl-Based alloys with nominal chemical compositions of Ti-45Al-5Nb- (B, Y) alloy has been investigated in this study. The results show that with the addition of the Y,the alloy is composed of γ,α2 and YAl2 phase forms mainly the lamellar colony boundaries as elongated or rounded particles and slightly inner the colonies as the finer particles. The microstructure of the alloy is remarkably refined including the lamellar colony size and lamellar spacing than Y-free alloys. The alloy has moderate tensile strength and ductility at room temperature, and the mainly reason for the improvement of Y-bearing TiAl alloy is superposition of the lamellar spacing and fine colony size. Cracks primarily propagate in transgranular mode in spite of the testing method.

关键词： TAl casting microstructure mechanical properties

作者: Yang Xin Xi Zhengping LiuYong Tang Huiping Jia Wenpeng HeWeiwei Liu Haiyan

作者单位: State Key Laboratory of Powder Metallurgy,Central South University ,Changsha, 410083, P. R. China St State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research ,Xi State Key Laboratory of Powder Metallurgy,Central South University ,Changsha, 410083, P. R. China State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous MetaI Research ,Xi

会议类型: 国际会议

会议名称: The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)

会议地点: 北京

会议语种:英文

页码: 1571-1574

在线出版日期: 2011-06-19（万方平台首次上网日期，不代表论文的发表时间）