Promoting the mechanical properties of Ti42Al9V0.3Y alloy by hot extrusion in the α plus β phase region

被引：3
作者：
Xu, Wen-chen [1 ]
Zhang, Hao [1 ]
Shan, De-bin [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A | 2010年 / 11卷 / 10期
关键词：
TiAl alloy; Microstructure; Mechanical property; Hot extrusion; TIAL ALLOYS; MICROSTRUCTURE;
D O I：
10.1631/jzus.A1000138
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot extrusion was conducted in the alpha+beta phase region for promoting mechanical properties of Ti42Al9V0.3Y. The microstructures and tensile properties before and after hot extrusion were studied. The results show that the microstructure of the as-cast alloy mainly consists of massive gamma phase in beta matrix and the as-extruded alloy mainly consists of lamellar alpha(2)/gamma, lamellar beta/gamma, and strip gamma propagating from elongated beta phase. In the as-cast alloy, the predominantly observed fracture mode is transgranular cleavage failure at room temperature and intergranular fracture at 650-750 degrees C. After hot extrusion, it transforms into transgranular cleavage-like failure, including translamellar cleavage and delamination. The excellent tensile properties of the as-extruded material are attributed to the obvious refined microstructure with broken YAl2 particles and the micro-crack shielding action of the TiAl lamellasome.
引用
收藏
页码：738 / 743
页数：6
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