Microstructure and Metastable Phase in Rapidly Solidified TiAl Alloy Prepared by Vacuum Suction Casting

被引：12
|
作者：
Liu, Yi [1 ]
Shi, Lei [1 ]
Yang, Guang [2 ]
Jin, Wen-zhong [1 ]
Cui, Jing [3 ]
机构：
[1] Luoyang Inst Sci & Technol, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China
[2] Shaanxi Univ Sci 86Technol, Coll Mech & Elect Engn, Xian 710021, Shaanxi, Peoples R China
[3] Shenzhen Polytech, Ind Training Ctr, Shenzhen 518055, Peoples R China
来源：
CRYSTAL RESEARCH AND TECHNOLOGY | 2019年 / 54卷 / 09期
关键词：
cooling rates; massive transformation; phase selection; suction casting; TI48AL2CR2NB ALLOY; THERMODYNAMICS; TRANSFORMATION; KINETICS; NB;
D O I：
10.1002/crat.201900054
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Effect of the cooling rates on microstructure and metastable phase formation in Ti-50Al-2Cr-2Nb alloy is investigated by vacuum suction casting to realize rapid solidification by chilling Cu-mold. The temperature distribution field is simulated by the ANSYS software, and the cooling rates are calculated about 6.0 x 10(3)-2.2 x 10(4) K s(-1) and 5.3 x 10(4)-6.0 x 10(4) K s(-1), respectively. The results show that phase selection and microstructural evolution are closely related to cooling rates. The transformation of primarily formed alpha phase into beta phase from directional growth zone to the mushy zone determined by microstructural analysis at the cooling rate of 6.0 x 10(3) K s(-1), indicates the occurrence of phase selection and the formation of metastable phase. In addition, the occurrence of massive transformation in the surface chilling zone is generally different from that of heat treatment due to high cooling rates during suction casting.
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页数：7
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