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中文摘要：
以从机械加工现场直接收集的AZ91D镁合金屑料为原料,采用热压制工艺再生制备半固态加工所需的坯料,研究二次加热过程中的半固态组织演变。结果表明,半固态组织演变可分为三个阶段：Mg17Al12相的溶解和Al原子的扩散,高溶质含量区域的熔化和固相颗粒的生成,固相颗粒的球化和长大。同时,在固相颗粒内部形成大量的嵌入式液滴。这种嵌入式液滴的数量和尺寸随着保温时间的变化而变化。随着保温时间的延长,固、液两相最终达到动态平衡,固相率不再发生变化。由于界面能降低和界面张力的作用使固相颗粒尺寸逐渐增大,并且越来越圆整。
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