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罗媛媛,毛小南,吴金平,杨英丽,郭荻子,宋飞飞,杨帆.新β型Ta-TiAl合金的高温开裂行为[J].稀有金属材料与工程(英文),2018,47(3):816~821.[LuoYuanyuan,Mao Xiaonan,WuJinping,Yang Yingli,GuoDizi,SongFeifei,YangFan.Fracture Behaviour for the New βTiAl Alloy during the Hot Deformation[J].Rare Metal Materials and Engineering,2018,47(3):816~821.]
Fracture Behaviour for the New βTiAl Alloy during the Hot Deformation
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Received:January 22, 2016  Revised:April 19, 2016
DOI:
Key words: TiAl alloy  Fracture behavior  Microstructure
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Author NameAffiliationE-mail
LuoYuanyuan 西北有色金属研究院 grass8180@126.com 
Mao Xiaonan 西北有色金属研究院  
WuJinping 西北有色金属研究院  
Yang Yingli 西北有色金属研究院  
GuoDizi 西北有色金属研究院  
SongFeifei 西北有色金属研究院  
YangFan 西北有色金属研究院  
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Abstract:
      The samples of TiAl-3Ta-x(Cr,W)(at%) were hot compressed by Gleeble-3800 in the temperature range of 1150~1300℃ from 0.1~1s-1 for high temperature fracture behavior and microstructure evolution study. The results show that the main fracture modes consist of 45° shear fracture and longitudinal fracture on free-surface, but which crack location is different. Moreover, the cracking degree increased with the decreasing of deformation temperature, the increasing of strain rate and height reduction.In the high strain rate range, deformation twinning dominated the entire deformation process.Morever, the cracks nucleation sites were observed at grain boundary of the colonies and/or interfaces between lamellae of the specimens, and initiate and propagate perpendicular to the compression axis.