采用光学显微镜、扫描电镜、透射电镜、硬度测试、拉伸测试等方法研究Cr元素对Al-Mg-Si-Cu铝合金组织与性能的影响.结果表明:Cr元素可以细化合金的铸态组织,促进β-A1FeSi相向α-AlFeSi相转变,并与基体结合形成A17Cr化合物等弥散相,显著抑制合金再结晶的产生及其晶粒长大.随着Cr含量的增加,合金的强度与塑性得到了显著的提高.当Cr含量超过0.20％(质量分数)时,合金的强度和塑性却出现了一定程度的降低.这主要是由于Cr元素与Fe,Si元素结合形成大量的AlFeCrSi相,减少了合金中Mg2Si相的析出,减弱了合金的时效强化效果.
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