The tensile properties and deformed microstructures of Ti–5Al–1V–1Sn–1Zr-0.8Mo (Ti5111) alloy with a bimodal structure under different deformation temperatures are investigated. As the deformation temperature decreases from 0 °C to −196 °C, the tensile strength, and elongation of Ti5111 increase simultaneously. The distinguishing characteristic of the deformed structure is the presence of $\left\{10\bar{1}2\right\}10\bar{1}1$ deformation twins (DTs) at −196 °C. These DTs can improve the tensile elongation by twinning-induced plasticity (TWIP), and make additional grains amenable for dislocation slip by changing the local microstructure orientation, promoting homogeneous deformation and contribute toward a higher elongation at −196 °C than that at 0 °C. The enhanced tensile strength at −196 °C is attributed to the coupling influence of the higher stress of dislocation slip at cryogenic temperature and the deformation twins-induced grain refinement.

研究了具有双峰结构的 Ti-5Al-1V-1Sn-1Zr-0.8Mo (Ti5111) 合金在不同变形温度下的拉伸性能和变形组织。随着变形温度从 0 °C 降低到 -196 °C，Ti5111 的拉伸强度和伸长率同时增加。变形结构的显着特征是存在$\left\{10\bar{1}2\right\}10\bar{1}1$-196 °C 下的变形孪晶 (DTs)。这些 DTs 可以通过孪生诱导塑性 (TWIP) 提高拉伸伸长率，并通过改变局部微观结构取向使额外的晶粒适合位错滑移，促进均匀变形，并有助于在 -196 °C 时的伸长率高于 0 °C 时的伸长率C。-196°C 时增强的抗拉强度归因于低温下位错滑移的较高应力和变形孪晶诱导的晶粒细化的耦合影响。