TC6钛合金变形组织不同取向绝热剪切敏感性研究

Study on Susceptibility of Different Directions of Deformed Contexture of TC6 Titanium Alloy to Adiabatic Shearing

摘要:

利用分离式Hopkinson Bar技术，对α+β双相钛合金TC6锻态变形组织不同取向圆柱试样进行动态压缩试验，结合力学响应及微观分析方法，研究TC6钛合金变形组织不同取向的绝热剪切敏感性。结果表明：TC6钛合金变形组织不同取向的绝热剪切敏感性不同，具有显著的各向异性特点，法向（ND）具有最高的绝热剪切敏感性，RD方向具有最小的绝热剪切敏感性。3种不同取向的绝热剪切敏感性差异主要是由于变形过程中各取向所产生的热软化效应不同所致。

Abstract:

By means of the technology of split Hopkinson bar, dynamic compression experimentation on TC6 titanium alloy have been carried out for cylindrical specimens cut along different directions of deformed contexture. The susceptibility of the different directions of deformed contexture of the TC6 titanium alloy to adiabatic shearing has been studied by means of associating their mechanical response under high strain rate with micro-analysis. Results show that the sensitivities of the different directions to adiabatic shearing are highly anisotropy. RD has the lowest sensitivity to adiabatic shearing and ND has the highest to adiabatic shearing. The differences of susceptibility of the different directions of deformed contexture to adiabatic shearing are caused by different thermal softening effect in the course of dynamic deformation