The strain rate effect (2.8 × 10⁻⁵–2.8 × 10⁻¹ s⁻¹) on the tensile properties and microstructure evolution of a β-type Ti-10Mo-1Fe (wt%) alloy has been investigated. With increasing strain rate, the yield strength increased, while the ultimate tensile strength, total elongation and uniform elongation decreased. It was found that deformation at a lower strain rate led to an enhanced work hardening rate (θ). This is reflected in the decreasing strain rate sensitivity of flow stress, m, with increasing strain. Strain rate sensitivity was positive at a smaller strain level (< 0.13), and decreased to a negative at a larger strain. The strain rate dependence of work-hardening behavior has been investigated and discussed in terms of the microstructure evolution, such as {332}<113> twins and dislocations. Electron Backscattered Diffraction (EBSD) and X-ray diffraction (XRD) analyses revealed lower increasing rates of {332}<113> twins and dislocation density at higher strain rates, which may be caused by adiabatic heating. This may lead to the reduced work-hardening rate on deformation at the higher strain rates.

研究了应变速率效应（2.8×10 ^-5 –2.8×10 ^-1  s ^-1）对β型Ti-10Mo-1Fe（wt％）合金的拉伸性能和组织演变的影响。随着应变率的增加，屈服强度增加，而极限抗拉强度，总伸长率和均匀伸长率降低。已经发现，在较低的应变率下的变形导致提高的加工硬化率（θ）。这反映在流动应力的应变率敏感性降低时，m，随着压力的增加。应变率灵敏度在较小的应变水平（<0.13）下为正，而在较大的应变下下降为负。已根据{332} <113>孪晶和位错等微观结构演变对加工硬化行为的应变率依赖性进行了研究和讨论。电子背散射衍射（EBSD）和X射线衍射（XRD）分析表明，{332} <113>孪晶的增加速率较低，并且在较高的应变速率下位错密度较高，这可能是由绝热加热引起的。在较高的应变速率下，这可能导致变形时的加工硬化率降低。