Dendritic structural transformation of laser surface remelted γ-TiAl based alloy during post-heat treatment

被引：6
作者：
Wu, GQ
Luo, GX
Huang, Z
Ruan, ZJ
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Laser Technol, Wuhan, Peoples R China
来源：
MATERIALS LETTERS | 2006年 / 60卷 / 03期
基金：
中国国家自然科学基金;
关键词：
TiAl based alloy; laser processing; heat treatment; hardness; microstructure;
D O I：
10.1016/j.matlet.2005.09.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser surface remelting followed by heat treatments at 1000 degrees C for different time was carried out on gamma-TiAl based alloy. The characteristics of structural transformation of laser surface remelted gamma-TiAl based alloy were investigated by high-temperature microscope, TEM and XRD. The results show that the phase transformation (alpha(2) -> gamma) in TiAl alloy occurred at the earlier stage of post-heat treatment, and the dendritic structure transformed firstly at the intergranular, then expanded into the transgranular, finally changed to ultrafine equiaxed grain structure, at the same time, micro-hardness of laser-surface remelted gamma-TiAl based alloy had the corresponding change with the structural trans fori-nation. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：406 / 409
页数：4
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