TC4钛合金在不同温度下的剪压缩失效  

The Shear Compression Failure of TC4 Titanium Alloy at Different Temperatures

作　　者：常德功[1] 于宁宁[1] 吕明利[1] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061

出　　处：《青岛科技大学学报（自然科学版）》2009年第4期349-352,共4页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省教育厅科技计划项目(J07YA10)

摘　　要：利用Fallwerk试验装置,在高应变率(102s-1)下,采用动态剪压缩试验研究TC4钛合金不同温度下的剪压缩失效现象。通过试验发现:相同温度下,流变应力随应变的增大不断增加,到达峰值后发生应力塌陷,即剪切失效;相同应变下,温度越高,材料的屈服强度和流变应力均明显下降,且峰值应力向应变增大的方向移动,即塑性变形能力逐渐加强;温度升高,材料的剪切失效能力减弱,在673 K至873 K温度区间内存在一个温度极限值。在该极限值以下,材料易发生剪切失效。同时,根据试验数据拟合了峰值应力和最大塑性应变与温度的曲线方程,为钛合金的研究提供了理论依据。Under the high strain rate （10^2 s^-1） condition, the shear compression failure of TC4 titanium alloy at different temperatures is researched using Fallwerk device and dynamic shear compression test method. It is found that flow stress increases with the augmentation of strain increasing at the same temperature and the stress collapse, namely shear failure will happen when the stress reaches peak value. The yield strength and flow stress are obviously decreasing with the rising of temperature at the same strain. The peak stress moves towards the direction of strain increase, which is gradual strengthening of plastic deformation capacity. weakened with the rising of temperature. A range of 673 K to 873 K. Under this value, At the same time, shear failure ability is temperature ultimate value exists in the shear failure will happen easily,and above this value, shear failure won＇t happen. Finally, the curve equations of peak stress and maximum plastic strain against temperature are fitted using experimental data. It can provide theoretical basis for research of titanium alloy.

关 键 词：钛合金 高应变速率 剪压缩试验 

分 类 号：TG146.2[一般工业技术—材料科学与工程]