微量Ga对A356合金微观组织及力学性能的影响  

Effects of Minor Gallium Addition on Microstructure and Mechanical Properties of A356 Alloy

作　　者：林金平[1] 赵洪生[2] 祝国梁[1] 王俊[1] 张军[2] 孙宝德[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室 [2]包头铝业有限公司

出　　处：《特种铸造及有色合金》2009年第10期957-960,共4页Special Casting & Nonferrous Alloys

基　　金：上海市曙光计划支持项目;上海市学科带头人计划支持项目

摘　　要：研究了微量Ga对A356合金的微观组织和力学性能的影响。结果表明,Ga含量的增加(0.02%～0.06%),对均匀化退火后A356合金室温抗拉强度影响不明显,在673K时抗拉强度提高14.5%,但Ga的加入显著降低合金的伸长率,且伸长率随着温度的增加而降低。Ga对T6处理后的强度略微提高,伸长率有所降低,但对合金高温抗拉强度和伸长率的影响作用效果明显,能大幅度提高高温抗拉强度,同时降低了合金的伸长率。Effects of trace gallium (0.02%~0.06%) on microstructure and tensile strength of A356 alloys were investigated. The results show that ambient tensile strength of homogenized annealed A356 alloy has been slightly affected while elevated tensile strength is increased by 14.5%, meanwhile, elongation is greatly decreased with increasing in Ga addition to 0.06%. Ambient tensile strength of the T6 treated A356 alloy with slightly decreasing in elongation is somewhat improved, however, elevated tensile strength is greatly improved, and elongation is obviously decreased with Ga addition.

关 键 词：GA A356合金 微观组织 力学性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]