研究了中间退火温度对多道次冷轧Al-Mg-Sc-Zr合金力学性能的影响.结果表明: 在各道次轧制前采用 400 ℃/ 1 h中间退火, 合金强度无明显变化;采用450 ℃/1 h中间退火, 合金强度随加工次数增加而明显降低. 对其机理分析表明, 冷变形产生的高密度位错等缺陷在较高温度的中间退火过程中为Sc和Zr原子提供了快速扩散的通道, 促进了Al3(Sc, Zr)相颗粒的粗化. Al3(Sc, Zr)颗粒的粗化不但使其阻碍位错运动的能力降低, 而且还削弱了其对回复进程的抑制作用.两种因素的共同作用导致了退火态合金强度的下降.
Influence of intermediate annealing temperature on strength of repeat cold -rolled Al-Mg-Sc-Zr alloy was studied. It was found that intermediate annealing at 400℃ has no obvious effect on the strength of the alloy, while it decreases with the rolling times，especially for yield stress, when 450℃ intermediate annealing was applied. High density of dislocations induced by cold rolling will provide fast diffusion channel for Sc and Zr atoms and promot the coarsening of the Al3(Sc, Zr) particles when samples were annealed at 450℃. As a result, Al3(Sc, Zr) particles had weak ability to hinder the movement of dislocations and recovery process of alloy, and the strength of the alloy were decreased.
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