采用应变诱导熔化激活法(SIMA法)制备了半固态7050铝合金坯料,研究了等温过程中晶粒的粗化规律.利用Gleeble-3500热模拟试验机分别对半固态7050铝合金和常规铸造7050铝合金进行了压缩实验,分析了其应力-应变关系,研究了半固态7050铝合金压缩变形时液固相协同变化规律,并对半固态7050铝合金和常规铸造7050铝合金的压缩裂纹扩展过程进行了研究.结果表明,常规铸造的7050铝合金的压缩应力明显偏高.变形量、变形温度和应变速率对显微组织变化和液相分布有明显影响.此外,由于半固态合金和铸造合金在显微组织上的显著差别,导致其裂纹的扩展过程也不一样,即分别对应着固-液分离过程和固 液、固-固混合分离过程.
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