对网篮组织TC21钛合金进行了0.001 s-1 ～50s-1的中应变速率室温拉伸试验.试验结果表明,TC21拉伸力学行为在试验应变速率范围内具有明显的应变速率强化效应、应变硬化效应和随应变速率升高而逐渐增大的温升软化效应；屈服应力的应变速率相关性在6s-1时发生转折；随应变率的升高,应变硬化效应减小,断裂应变和失稳应变增大；试验应变速率范围内TC21的变形机制为位错的热激活机制.SEM和金相观察结果表明,TC21的断裂方式均为韧性断裂,断裂机理为微孔洞的聚集和长大.
Abstract:Tensile tests were conducted on TC21 Titanium alloy with basket microstructure in 0.001s-1 ～50s-1 strain rate.Test results indicate that the alloy exhibits significant strain rate strengthening,strain hardening and strain-rate sensitive thermal-softening under strain.Strain-rate sensitivity of yield stress turns at 6s-1.Strain hardening decreases with increasing strain rate while unstable strain and fracture strain under high strain rates are larger than those under low strain rates.Mechanism governing deformation is dislocation thermal activity.All specimens fracture in a ductile manner and the fracture mechanism is voids nucleation and growth.
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