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OALib Journal期刊
ISSN: 2333-9721
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7050铝合金半固态压缩变形行为及组织演变
DOI: 10.3724/SP.J.1037.2013.00329, PP. 1597-1603
Keywords: 铝合金半固态,显微组织,压缩,固液分离
Abstract:
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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