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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。
The heat treatment process of cast Al-7Si-2.5Cu-0.3Mg alloy was studied by phase diagram calculation, DSC, tensile test and microstructure analysis. The results show that the low melting point eutectic structure transformation occurred at about 515 ℃ and about 535 ℃ for Al-7Si-2.5Cu-0.3Mg alloy. After 500 ℃ × 4h solution, the low melting point eutectic alloy can be completely dissolved. The alloy can be single-stage solution heat treatment and grading solution heat treatment process, single-stage solution heat treatment process is: 500 ℃ × 10h +175 ℃ × 6h, fractional solution heat treatment process is 500 ℃ × 4h +520 ℃ × 8h + 175 ° C × 6h.