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,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.]
新β型Ta-TiAl合金的高温开裂行为
投稿时间:2016-01-22  修订日期:2016-04-19
中文关键词:  TiAl基合金  开裂行为  微观组织
基金项目:
中文摘要:
      利用Gleeble-3800型热模拟试验机对铸态TiAl-3Ta-x(Cr,W)合金合金进行了等温热压缩试验,研究了该合金在1150~1300℃及0.1~1s-1应变速率下的高温变形后的开裂机理。结果表明:铸态合金表面开裂主要以45°剪切开裂和纵向自由表面开裂断裂形貌为主,但起裂位置不同;合金的热变形损伤以及开裂行为对热加工参数极为敏感,且其开裂程度随着变形温度的降低、应变速率的增加以及变形量的增加而变化。合金在高温高应变速率下热变形,易在晶界附近形成高密度位错,变形位错与滑移带等微缺陷,并在进一步变形中形成微裂纹。微裂纹沿着β晶界,α2/γ片层内,在相邻晶粒之间,晶界与晶内等位置形核。
Fracture Behaviour for the New βTiAl Alloy during the Hot Deformation
英文关键词:TiAl alloy  Fracture behavior  Microstructure
英文摘要:
      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.
作者单位E-mail
罗媛媛 西北有色金属研究院 grass8180@126.com 
毛小南 西北有色金属研究院  
吴金平 西北有色金属研究院  
杨英丽 西北有色金属研究院  
郭荻子 西北有色金属研究院  
宋飞飞 西北有色金属研究院  
杨帆 西北有色金属研究院  
摘要点击次数: 373
全文下载次数: 91
查看全文  查看/发表评论  下载PDF阅读器
关闭