In this work, the microstructure evolution and slip mechanism of TC21 titanium alloy in grind hardening (GH) and grind hardening and aging treatment (GHAG) were comparatively investigated. The experimental results showed that the hardened layer formed in both GH and GHAG is mainly composed of TiN, while their internal microstructure is quite different. Compared with as-received alloy, the tensile strength and elongation after GH process increased by 110 MPa and 1.5%, respectively. The tensile strength after GH process increased by 50 MPa but the elongation decreased by 0.2%. Moreover, A method to deduce slip systems by using interior crystall misorientation axis (ICMA) was demonstrated in this paper. The distribution of ICMA indicated that three major slip systems were activated which was verified by texture components in ODF sections. The slipping results in two kinds of crystal orientation distribution: (a) the activated slip plane parallel to loading stress; (b) the slip direction parallel to loading stress, but existing a deviation angle between slip plane and loading stress.

在这项工作中，比较研究了TC21钛合金在磨削硬化（GH）和磨削硬化和时效处理（GHAG）中的组织演变和滑动机理。实验结果表明，在GH和GHAG中形成的硬化层主要由TiN组成，而它们的内部微观结构却大不相同。与原合金相比，GH处理后的抗拉强度和伸长率分别增加了110 MPa和1.5％。GH处理后的抗拉强度增加了50 MPa，但伸长率却降低了0.2％。此外，本文还介绍了一种利用内部晶体取向差轴（ICMA）推导滑移系统的方法。ICMA的分布表明已激活了三个主要的滑移系统，这已通过ODF截面中的纹理分量进行了验证。滑移导致两种晶体取向分布：（a）激活的滑移平面与加载应力平行；（b）滑动方向与载荷应力平行，但在滑动面和载荷应力之间存在偏角。