采用光学显微镜、扫描电镜、电子背散射衍射以及高温拉伸实验研究了工业化制备的5A90铝锂合金超塑性板材变形过程中的组织演变及变形机理.结果表明:在高温拉伸前对板材进行450℃/30min再结晶退火后,在温度为475℃、应变速率为8×10-4s-1的适宜超塑性变形条件下,可使伸长率由原始状态的480％提高至880％.整个超塑性变形过程展现出不同的变形机制:初始阶段(ε≤0.59),板材以形变组织为主,晶粒取向差逐渐增大,位错运动为该阶段的主要变形机制.当真应变达到0.59时,动态再结晶开始发生,晶粒取向差继续增大,晶界滑动开始启动.当真应变大于1.55时,晶粒继续长大,但长大幅度不大且保持等轴状,该阶段变形机制以晶界滑动为主.
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