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将AZ91镁合金/1060纯铝爆炸复合板进行退火处理,对热处理前后结合界面处的显微组织、成分分布、力学性能进行分析和研究。结果表明,退火过程中镁元素易于向纯铝中扩散,扩散层主要位于靠近界面的纯铝中;退火后的复合板界面处的扩散层厚度和最高硬度均比未热处理时有明显提高,高硬度层从原始复合板界面的镁合金一侧转移到纯铝一侧,原始复合板中引起界面处硬度升高的原因是加工硬化效应,热处理后界面处的高硬度是由于在扩散层中产生镁-铝固溶体和金属间化合物;随着退火温度的升高,界面处扩散层厚度增加,组织中发生再结晶趋势增强,形变带逐渐消失。
The AZ91 magnesium alloy / 1060 pure aluminum explosion composite plate was annealed, and the microstructure, composition distribution and mechanical properties before and after heat treatment were analyzed and studied. The results show that during the annealing process, magnesium easily diffuses into pure aluminum and the diffusion layer is mainly located in the pure aluminum close to the interface. The thickness and maximum hardness of the diffusion layer at the interface of the annealed composite plate are obviously higher than those without heat treatment. The hardness layer is transferred from the magnesium alloy side of the original composite plate interface to the pure aluminum side. The reason for the increased hardness at the interface in the original composite plate is the work hardening effect. The high hardness at the interface after the heat treatment is due to the generation in the diffusion layer Mg-Al solid solutions and intermetallic compounds. With the increase of annealing temperature, the thickness of the diffusion layer at the interface increases, the recrystallization tendency increases in the microstructure, and the deformation zone disappears gradually.