An investigation of microstructure formation during solidification of gamma titanium aluminide alloys

被引：0
|
作者：
Küstner, V [1 ]
Oehring, M [1 ]
Chatterjee, A [1 ]
Güther, V [1 ]
Brokmeier, HG [1 ]
Clemens, H [1 ]
Appel, F [1 ]
机构：
[1] GKSS Forschungszentrum Geesthacht GmbH, Mat Res Inst, D-21502 Geesthacht, Germany
来源：
GAMMA TITANIUM ALUMINIDES 2003 | 2003年
关键词：
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The microstructure formation during solidification of arc-melted gamma(TiAl) binary and multi-component alloys has been studied by scanning electron microscopy, micro-analytical and texture investigations. It was found that alloys based on Ti-45Al (at.%) exhibit an isotropic, equiaxed and texture-free microstructure with modest micro-segregation, whereas peritectic alloys solidify in the lower part of the buttons in a cellular or cellular-dendritic mode resulting in anisotropic microstructures as well as significant texture and segregation. This difference is attributed to the columnar/equiaxed transition, which for the beta phase seems to be favoured over the a phase due to a kinetic preference of heterogeneous nucleation and a larger freezing interval. Among the investigated ternary or further alloying additions, only B was found to have a significant effect on the solidification microstructure, disregarding microstructural changes in the solidified material due to solid-state transformations.
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页码：89 / 96
页数：8
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