【摘要】 蠕变加载对结构件的服役性能会产生一定的影响。本研究对等轴、双态、魏氏组织Ti6321钛合金进行蠕变预加载，对蠕变后的材料进行动态压缩试验，应变率为3000 s-1，研究经不同蠕变应力加载后的Ti6321钛合金动态力学行为。结果表明：蠕变后钛合金的动态力学性能均表现出屈服温度下降，抗压强度上升。随蠕变应力增加，3种组织钛合金在动态压缩后的冲击吸收功增大，绝热剪切敏感性降低。未蠕变的钛合金经动态压缩后均产生相变带，等轴组织和双态组织钛合金蠕变预加载再经动态压缩后未失效，仅产生形变带，魏氏组织产生相变带导致失效。蠕变推迟了等轴组织和双态组织钛合金的绝热剪切相变的发生。更多还原

【Abstract】 Creep loading has a certain effect on the service performance of structural components. In this research, the creep preloading on Ti6321 titanium alloy with equiaxed, bimodal and Widmanstatten microstructures was carried out. Dynamic compression tests of the materials after creep were conducted at a strain rate of 3000 s-1. The dynamic behavior of Ti6321 titanium alloy after different creep stress loadings was studied. The results show that the yield strength decreases and the compressive strength increases after creep preloading.With the increase in creep stress, the impact absorption energy of titanium alloy of three microstructures after dynamic compression increases and the adiabatic shear sensitivity decreases. Titanium alloys without creep have phase transition bands after dynamic compression, and the titanium alloys with equiaxed microstructure and bimodal microstructure after dynamic compression followed by creep preloading do not fail but only produce deformation band. Titanium alloy with Widmanstatten microstructure fails due to phase transition bands. The adiabatic shear of titanium alloys with equiaxed and bimodal microstructures is delayed by creep.更多还原