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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=Nι_jb~2zAVexp{-(△H_s-ι_jb~2τ/kT}。然后计算得到两种合金在不同温度下的割阶间距ι_j,运动位错密度ρ=Nι_j,割阶密度N以及位错速度等数值。
The deformation at high temperature of Al-3% Mg and Al-6% Mg alloys was studied by the tensile test at variable temperature and variable speed. The activation energy, activation volume and frequency factor were obtained at different temperatures. It is proved that the deformation mechanism of aluminum-magnesium alloy may be a non-conservative movement with cut-off screw dislocation in the temperature range of 250-400 ℃, the deformation equation is ε = Nι_jb ~ 2zAVexp {- (ΔH_s-ι_jb ~ 2τ / kT } Then calculate the cut-off pitch ι_j, movement dislocation density ρ = Nι_j, cut order density N and dislocation velocity of two alloys at different temperatures.