The Effect of Pressure Stress on the Evolution of B2(ω) Phase in High Nb Containing TiAl Alloy

被引：9
|
作者：
Cao, Bei [1 ]
Yang, Jieren [1 ]
Wang, Xuyang [1 ]
Hu, Rui [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi Provinc, Peoples R China
来源：
ADVANCED ENGINEERING MATERIALS | 2017年 / 19卷 / 06期
基金：
中国国家自然科学基金;
关键词：
MECHANICAL-PROPERTIES; OMEGA(O) PHASE; BETA-PHASE; MICROSTRUCTURAL INSTABILITY; THERMAL EXPOSURE; DEFORMATION; STABILITY; BEHAVIOR; TRANSFORMATIONS; INTERMETALLICS;
D O I：
10.1002/adem.201600844
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The thermal stability of the B2() phase in high Nb containing TiAl alloy has attracted intense attention in recent years. This study focuses on the phase transformation between B2 and phases under the influence of thermal pressure stress in the Ti-45Al-8.5Nb-(W, B, Y) alloy. A large number of phases with the volume fraction of 42.3% exist within the B2 region in as-cast alloys. The as-cast samples were subjected to thermo-compressive loading at 850 and 900 degrees C under the stresses of 300 and 500MPa. Results show that the transformation of B2 occurs at 850 degrees C, which can be promoted under a pressure stress. Further, the particles dissolved into the B2 matrix at 900 degrees C, and this transformation is suppressed by the role of thermal pressure. The mechanisms of the phase transformations mentioned above were discussed.
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收藏
页数：5
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