摘要
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 A1-7Si-2.5Cu-0.3Mg alloy was studied by calculating alloy phase diagram, differential thermal analysis （DSC）, tension testing and microstructure observation. The results show that the phase-transfor- mation temperature of the euteetics in the alloy is about 515 ℃ and 535 ℃. Atter solution treated at 500 ℃ for 4 h, the low melting temperature eutectics in the alloy is fully dissolved in aluminum matrix. Single-stage solid solution and multistage solid solution is suitable for this alloy. The optimized single-stage solid solution heat treatment and multistage solid solution heat treatment process is 500 ℃× 10h＋ 175 ℃× 6 h and 500 ℃×4h＋520 ℃ ×8h＋ 175 ℃× 6h, respectively.
出处
《热加工工艺》
CSCD
北大核心
2012年第12期192-195,198,共5页
Hot Working Technology
关键词
铸造铝合金
力学性能
显微组织
固溶处理
cast aluminum alloy
mechanical properties
microstructure
solution treatment
