Ti60钛合金中等轴α相变形机理的原位EBSD研究

In-situ EBSD study on deformation mechanism of Ti60 titanium alloy equiaxedαphase

本文通过热处理得到了具有等轴状α相的Ti60钛合金,并用原位背散射电子衍射(in-situ EBSD)技术,系统研究了该合金单轴拉伸过程中的塑性变形机制。结果表明:该合金的塑性变形机制以滑移为主导,主要滑移系为{0001}<1ˉ2ˉ1ˉ0>和{011ˉ0}<112ˉ0>,且前者早于后者启动。值得注意的是,当拉伸应变超过10%时,{101ˉ2}<1ˉ011>孪晶开始启动,并进一步协调基体的变形。

The equiaxedαphase was obtained by heat treatment of Ti60 high temperature titanium alloy,and the plastic deformation mechanism of the close-packed hexagonal equiaxed crystal was observed in-situ EBSD.The results show that the plastic deformation mechanism of the high temperature titanium alloy is mainly dominated by slip,and the slip systems are{0001}<1ˉ2ˉ1ˉ0>and{011ˉ0}<112ˉ0>,respectively,and{0001}<1ˉ2ˉ1ˉ0>is activated earlier than{011ˉ0}<112ˉ0>.When the plastic deformation reaches 10%,{101ˉ2}<1ˉ011>twins start to further coordinate the deformation of the matrix.