摘要
研究了三种不同处理的Ｔｉ—５５合金在Ｈｏｐｋｉｎｓｏｎ压杆上高速冲击变形时产生的热塑剪切带结果表明，三种不同处理的合金试样在不同应变率下出现两种类型的剪切带：形变剪切带和“白色”剪切带．它们是在不同应变阶段下形成的对应“白色”剪切带有一应变突变ＴＥＭ观察未发现“白色”剪切带内发生相变、孪生是该合金动态冲击时变形的重要方式．
The deformation and microstructure of the thermo-plastic shear bands in three kinds ofdifferently treated Ti-alloys produced during high speed impact compression with strain rate of order of103s-1 have been investigated by split Hopkinson bar. The results show that there are two types of shearbands, deformed-and white-shear bands to be commonly recognized. They occur at different deformationstages during localization. The deformed shear bands appear first, and the white shear bands are the resultof further development of the deformed shear bands. A critical strain is required for the formation ofdeformed-and white-shear bands under a critical strain rate during localization. Observations by TEMshow that there is no evidence for phase transformation in the white shear bands, and twinning is themajor deformation mode in the shear bands during dynamic leading.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第4期379-383,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
剪切带
临界应变率
微观结构
钛合金
shear band, critical strain rate, microstructure, Ti-55 alloy
