In this study, a Ti–33Zr–12Al–6V alloy was prepared, and its work hardening and softening mechanisms were investigated via tensile tests conducted at room temperature. The interaction between the dislocations and strain-induced martensite (SIM) results in work hardening; whereas, the shearing of the grain boundaries by the dislocations for entering the adjacent grains results in work softening, which occurs when the logarithmic strains is between 5.8% and 7.6%. Work softening weakened the effect of work hardening; however, through work softening, the workability, which is insufficient in high-strength β-phase titanium alloys, was significantly increased. The microstructure evolution of Ti–33Zr–12Al–6V alloy under different strains was investigated using the quasi in-situ electron backscatter diffraction and scanning electron microscopy methods during the aforementioned tensile tests. The microstructure near the shear bands was observed via transmission electron microscopy using a focused ion beam. First, the {112}<111> slip systems with a high Schmid factor (SF) (＞0.25) were activated and, subsequently, the {112}<111> with a low SF (≤0.25) and {011}<111> slip systems were activated in most grains during tensile deformation.

在这项研究中，制备了一种 Ti-33Zr-12Al-6V 合金，并通过在室温下进行的拉伸试验研究了其加工硬化和软化机制。位错与应变诱导马氏体 (SIM) 之间的相互作用导致加工硬化；而位错进入相邻晶粒对晶界的剪切导致工作软化，这发生在对数应变在 5.8% 和 7.6% 之间。加工软化削弱了加工硬化的效果；然而，通过加工软化，高强度β相钛合金中不足的可加工性显着提高。在上述拉伸试验中，使用准原位电子背散射衍射和扫描电子显微镜方法研究了 Ti-33Zr-12Al-6V 合金在不同应变下的显微组织演变。使用聚焦离子束通过透射电子显微镜观察剪切带附近的微观结构。首先，具有高 Schmid 因子的 {112}<111> 滑移系 (SF ) (＞0.25) 被激活，随后，具有低SF (≤0.25) 的{112}<111> 和{011}<111> 滑移系统在拉伸变形过程中在大多数晶粒中被激活。