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利用分离式Hopkinson压杆(SHPB),得到了近β型Ti-22Nb合金和稳定β型Ti-47Nb合金在室温高应变率(10~3s~(-1))加载条件下的动态真应力-真应变曲线,并观察了动态冲击后试样的绝热剪切带(ASB)形貌特征。结果表明:近β型Ti-22Nb合金在高应变率加载下较易发生绝热剪切破坏。近β型Ti-22Nb合金的主要析出相为弥散分布的颗粒状纳米ω相,表现出了明显的应变强化效应,Ti-22Nb主要析出相为针状次生α相时,具有比前者更大的平均流变应力。稳定β型Ti-47Nb合金试样没有发生绝热剪切破坏,应变率达到4800 s~(-1)时,该合金的热软化效应明显。
The dynamic true stress of the near-β Ti-22Nb alloy and the stable β-Ti-47Nb alloy under the high strain rate (10 ~ 3s -1) loading condition were obtained by using the split Hopkinson pressure bar (SHPB) True strain curve, and observed the morphology of adiabatic shear band (ASB) after dynamic impact. The results show that adiabatic shear failure occurs in the near-β Ti-22Nb alloy under high strain rate loading. The main precipitated phase of the near-β type Ti-22Nb alloy is the dispersed nano-co-phase nano-particles, which shows a significant strain strengthening effect. When the main precipitates of Ti-22Nb are acicular secondary α phase, The average flow stress. The adiabatic shear failure did not occur in the stable β-Ti-47Nb alloy specimens. The thermal softening effect of the alloy was obvious when the strain rate reached 4800 s -1.