Effects of solidification parameters on the growth direction of α phase in directionally solidified Ti-49A1 alloy

被引：12
作者：
Fan, Jianglei [1 ,2 ]
Zhang, Chi [1 ]
Wu, Shen [1 ]
Gao, Hongxia [1 ]
Wang, Xiao [3 ]
Guo, Jingjie [4 ]
Fu, Hengzhi [4 ]
机构：
[1] Zhengzhou Univ Light Ind, Inst Mech & Elect Engn, Zhengzhou 450002, Henan, Peoples R China
[2] Zhengzhou Univ Light Ind, Henan Key Lab Mech Equipment Intelligent Mfg, Zhengzhou 450002, Henan, Peoples R China
[3] Zhengzhou Univ Light Ind, Sch Energy & Power Engn, Zhengzhou 450002, Henan, Peoples R China
[4] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China
来源：
INTERMETALLICS | 2017年 / 90卷
基金：
中国国家自然科学基金;
关键词：
Intermetallics; Titanium aluminides; Crystal growth; Casting; Microstructure; TIAL/TI3AL LAMELLAR MICROSTRUCTURE; TIAL-SI ALLOYS; MECHANICAL-PROPERTIES; TI-46AL-0.5W-0.5SI ALLOY; ORIENTATION CONTROL; TI-50AL-4NB ALLOY; ALIGNMENT; GAMMA; MO; MICROHARDNESS;
D O I：
10.1016/j.intermet.2017.07.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Growth directions (GD) variation of a phase in Ti-49A1 (at.%) alloy with solidification parameters were studied by using directional solidification technology. GD of the primary phase (alpha phase) changed with growth rate (V) and temperature gradient (G). Evolutions of theta (the angle between the preferred growth direction (PG) and heat flow direction (HD) and Psi (the angle between GD and HD) with V and G are presented. By controlling the solidification parameters accurately, the grains of a solidified TiAl alloy can grow with <11<(2)over bar>0> direction or close to this direction during directional solidification, which is beneficial to the lamellar orientation control of TiAl alloys. For present experimental conditions, the feasible solidification condition for the lamellar orientation control of TiAl alloy by the seeding technology is: V = 10 mu m/s similar to 20 mu m/s and G = 10 K/mm similar to 12.1 K/mm.
引用
收藏
页码：113 / 118
页数：6
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