近共晶Al-11.6Si-3Cu合金组织与性能研究  

Microstructures and Properties of Near Eutectic Al-11.6Si-3Cu Alloy

作　　者：张余[1,2] ZHANG Yu(National-local Joint Engineering Laboratory of Intelligent Manufacturing Technology for Automobile Mould, Tianjin University of Technology and Education, Tianjin 300222, China;School of Automobile and Mechanical Engineering, Zhejiang Industry ＆ Trade Vocational College, Wenzhou 325003, China)

机构地区：[1]天津职业技术师范大学汽车模具智能制造技术国家地方联合工程实验室,天津300222 [2]浙江工贸职业技术学院汽车与机械工程学院,浙江温州325003

出　　处：《铸造技术》2018年第5期1000-1003,共4页Foundry Technology

基　　金：天津市高等学校学科领军人才资助项目(RC14-02);天津职业技术师范大学优秀青年教师资助项目(RC14-17);工信部重大专项<装备复杂零部件个性化快速定制智能制造新模式>资助项目(2016FM02001);温州市"551人才工程"科研资助项目

摘　　要：在近共晶Al-11.6Si-3Cu合金中,加入Mg、Zn进行合金化处理以及Ti、Sb进行变质处理,研究T6热处理工艺对合金组织与性能的影响。结果表明,经合金化和变质处理后,近共晶Al-11.6Si-3Cu合金中共晶硅相由粗针状转变为细小纤维状,Al_2Cu相变化不明显;Al-11.6Si-3Cu合金T6热处理的最佳工艺为525℃固溶8 h,50~60℃水冷,175℃时效8 h,空冷。经T6热处理后,共晶硅相边角钝化变圆,由细小纤维状转变为短棒状或椭圆状。合金抗拉强度和硬度分别为435 MPa和138 HB。Alloying and modification treatment were carried out on near eutectic Al-11.6Si-3Cu alloy by adding Mg, Zn and Ti, Sb, respectively. And the effect of T6 heat treatment process on the microstructure and properties of the alloy were investigated. The results show that the morphology of eutectic silicon in near eutectic Al-11.6Si-3Cu alloy changes from coarse needlelike to fine fiber shape after alloying and modifying, while the variation Al2Cu phase is not obvious. The optimal process of T6 heat treatment of Al-11.6Si-3Cu is solid solution at 525 ℃ for 8 h then water cooling at 50-60℃, and aging at 175℃ for 8 h then air cooling. Comer of the eutectic silicon goes to circle gradually after T6 heat treatment. The fine fiber shape eutectic silicon changes into short-rod shape or elliptical shape. The tensile strength of the alloy achieves 435 MPa, and the hardness is 138 HB.

关 键 词：近共晶Al-11.6Si-3Cu合金 合金化 变质处理 T6热处理 组织与性能 

分 类 号：TG113[金属学及工艺—物理冶金]