【摘要】 采用等温压缩实验并结合电子背散射衍射手段，研究了应变速率对7065铝合金热变形行为的影响规律。结果表明，随着应变速率由0.001 s^-1增加到30 s^-1,合金的动态再结晶面积分数先显著减少，在1 s^-1时达到较低水平，而后变化幅度小于10%,当应变速率大于1 s^-1时，合金的亚结构面积分数显著增加。低应变速率阶段(0.001～1 s^-1)的软化机制为动态再结晶（DRX）机制和动态回复（DRV）机制，而高应变速率阶段(1～30 s^-1)的软化机制为DRV机制。随着应变速率的增加，等温压缩变形后合金的形变储能逐渐增加。更多还原

【Abstract】 The effect of strain rate on the hot deformation behavior of 7065 aluminum alloy was investigated by isothermal compression experiments and electron backscatter diffraction. The results show that as the strain rate increases from 0.001 s^-1 to 30 s^-1, the dynamic recrystallization area fraction of the alloy first decreases significantly, reaching a lower level at 1 s^-1, and then the change is less than 10%, and the substructure area fraction increases significantly when the strain rate is greater than 1 s^-1. The softening mechanisms in the low strain rate range(0.001—1 s^-1) are dynamic recrystallization（DRX） mechanism and dynamic recovery（DRV） mechanism, while the softening mechanism in the high strain rate range(1—30 s^-1) is DRV. With the increase of strain rate, the deformation stored energy of alloy after isothermal compression deformation gra-dually increases.更多还原