摘要 用变温变速的拉伸试验,研究了Al-3%Mg和Al-6%Mg合金的高温变形行为,求得各温度下的激活能、激活体积和频率因子等。证明在250—400℃温度范围内,铝-镁合金变形机构可能是带割阶的螺位错作非保守性运动,变形方程为ε=Nιjb2zAνexp{-(△Hs-ιjb2τ)/(kT)}。然后计算得到两种合金在不同温度下的割阶间距ιj,运动位错密度ρ=Nιj,割阶密度N以及位错速度等数值。 Abstract The high temperature deformation of Al-3% Mg and Al-6% Mg alloys has been investigated by differential tensile tests. The activation energies, activation volumes and frequency factors at different temperatures have been obtained. The controlling deformation mechanism in the temperature range 250-400℃ is proved to be possibly due to the non-conservative motion of jogged screw dislocations. The deformation equation is ε=Nιjb2zAνexp{-(△Hs-ιjb2τ)/(kT)}. Thereafter the jog spacings, dislocation densities, jog densities and dislocation velocities at different temperatures are calculated for both alloys. In the above equation ε is the strain rate, b the Burgers vector, Z the coordination number, A the entropy factor, v an atomic frequency, △Hs the self-diffusion coefficient, τ the applied shear stress, k Boltzmann's constant and T the absolute temperature. 作者及机构信息 王其闵3, 王遂福3, 窦仲伟2, 郭懋端1 (1)上海科技大学; (2)浙江大学; (3)中国科学院 Authors and contacts WANG CHI-MIN3, WANG ZAI-FO3, DOU CHUNG-WEI2, KUO MOU-DUAN1 (1)上海科技大学; (2)浙江大学; (3)中国科学院 参考文献 [1] 施引文献