The role of stress-induced β → α″ martensitic transformation in contributing to the exceptional strain-hardening behavior of a Ti-11Mo (wt. %) model alloy was studied. The results reveal that the α″-martensite plates, undergoing relatively high transformation strains upon formation, act as effective barriers against dislocation motion. As deformation proceeds, the progressive generation of these plates dynamically reduces the dislocation mean free path (dynamic Hall-Petch effect), while simultaneously encouraging the accumulation of dislocations. These dual effects substantially enhance the flow stress with increasing strain, thereby resulting in remarkable strain-hardenability, a crucial factor for maintaining excellent ductility. This study presents innovative experimental evidence elucidating the mechanism of the transformation-induced plasticity effect in metastable β-titanium alloys, while also offering insights for designing novel alloys with superior strain-hardenability and ductility.

中文翻译：

---

应力诱导马氏体相变对 Ti−Mo 基亚稳 β 钛合金应变硬化行为的显着贡献


研究了应力诱发的 β → α” 马氏体相变对 Ti-11Mo (wt.%) 模型合金异常应变硬化行为的影响。结果表明，α”-马氏体板在形成时经历相对较高的相变应变，可作为位错运动的有效屏障。随着变形的进行，这些板的逐渐生成会动态地减少位错平均自由程（动态霍尔-佩奇效应），同时促进位错的积累。这些双重效应随着应变的增加而显着增强流变应力，从而产生显着的应变硬化性，这是保持优异延展性的关键因素。这项研究提供了创新的实验证据，阐明了亚稳β钛合金中相变诱导塑性效应的机制，同时也为设计具有优异应变硬化性和延展性的新型合金提供了见解。