Microstructure evolution and interfacial reaction of TiAl-Si alloy solidified in alumina crucible

被引：8
作者：
Fan, J. [1 ]
Guo, J. [2 ]
Wang, S. [1 ]
Tian, S. [1 ]
Su, Y. [2 ]
Liu, J. [1 ]
Fu, H. [2 ]
机构：
[1] Zhengzhou Univ Light Ind, Mech & Elect Engn Inst, Zhengzhou 450002, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2015年 / 31卷 / 14期
基金：
中国国家自然科学基金;
关键词：
Intermetallics; Directional solidification; Microstructure; Ceramic crucible; Interface reaction; INTERMETALLIC TI-46AL-2W-0.5SI ALLOY; DIRECTIONAL SOLIDIFICATION; TI-46AL-0.5W-0.5SI ALLOY; LAMELLAR ORIENTATION; GAMMA; MICROHARDNESS; PARAMETERS;
D O I：
10.1179/1743284714Y.0000000748
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure evolution of Ti-43Al-3Si (at-%) alloy solidified in alumina crucible was investigated by directional solidification technology. After directional solidification, the microstructure of the alloy is consisted of gamma-TiAl, alpha(2)-Ti3Al, xi-Ti5Si3 phases and Al2O3 particles. There are three morphologies of xi phases formed in the alloy, namely, long rod-like, cluster-like with eutectic morphology, and needle-like shape. The volume fraction of xi phases decreases with increasing growth rates. Al2O3 particles broke from the crucible and enter into the melt by the thermal physical erosion. Al2O3 particles enrich in the liquid phase with the moving of solid-liquid interface, and are captured or entrapped by dendrites during solidification. The Al2O3 particles mainly distributed in the interdendritic region, and some particles exist in dendrites.
引用
收藏
页码：1727 / 1734
页数：8
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