铸造Al-7Si-2.5Cu-0.3Mg合金的热处理工艺研究
Hot Working Technology（2012）
Abstract
通过相图计算、示差热(DSC)分析,拉伸试验及显微组织分析,对铸造Al-7Si-2.5Cu-0.3Mg合金的热处理过程进行了研究.结果表明:Al-7Si-2.5Cu-0.3Mg合金在515℃左右和535℃左右发生低熔点共晶组织转变,经500℃×4h固溶后,可使合金中低熔点共晶物完全溶解；该合金热处理可以采用单级固溶和分级固溶热处理工艺,单级固溶热处理工艺为:500℃×10h+175℃×6h,分级固溶热处理工艺为500℃×4h+520℃×8h+ 175℃×6h.
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Key words
solution treatment,microstructure,mechanical properties,cast aluminum alloy
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