Cu对铸造Al-Si-Cu合金组织和力学性能的影响  

Effects of Cu on Microstructure and Mechanical Properties of Al-Si-Cu Cast Alloy

作　　者：鲍庆煌 叶兵[1] 王其贵 杨文英[2] 谢超英[1] 蒋海燕[1] 丁文江[1] 

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心、金属基复合材料国家重点实验室 [2]美国通用汽车公司全球动力工程部

出　　处：《特种铸造及有色合金》2016年第5期536-539,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51374145);上海交通大学启动基金资助项目(13X100040023);上海市科技创新行动计划资助项目(14521100600)

摘　　要：通过金属型铸造制备了Al-Si-Cu合金,结合扫描电镜和能谱仪对合金的组织进行分析,对不同热处理状态下的合金进行力学性测试,研究了Cu对铸造Al-Si-Cu合金组织和力学性能的影响,并通过热分析确定了合金的最佳热处理工艺。结果表明,试验优化后的Al-Si-Cu合金铸造性能优良,热处理后其力学性能得到大幅提升。当Cu含量在0.6%-3.5%之间时,随着Cu含量的增加,合金中Al2Cu相和Q-Al5Cu2Mg8Si6相增加,合金的力学性能有明显提高,抗拉强度增幅最高达17%,而伸长率下降。The Al-Si-Cu alloy was prepared by permanent mold casting.The microstructure of the alloy was analyzed by SEM and EDS,and the mechanical properties of the alloy prepared were measured under different heat treatment conditions.The properties of the Al-Si-Cu alloy were analyzed by comparing microstructure,and the optimized heat treatment process of Al-Si-Cu alloy was determined by thermal analysis.The results show that Al-Si-Cu cast alloy exhibits good castability and excellent mechanical properties after heat-treatment.With Cu content in range of 0.6% ~ 3.5%,with the increase of Cu content,Al2Cu and Q-Al5Cu2Mg8Si6 phase will be increased,so the alloy exhibits the higher strength and the lower elongation,where the maximal increment of tensile strength reaches up to 17%.

关 键 词：AL-SI-CU合金 微观组织 力学性能 固溶处理 

分 类 号：TG146.21[一般工业技术—材料科学与工程]