Al-9Si-2Cu-xFe合金的微观组织及力学和导热性能研究  

Microstructure,Mechanical and Thermal Properties of Al-9Si-2Cu-xFe Alloy

作　　者：张瑞啸 汤传尧 刘乐华 罗宗强[1] 张卫文[1] ZHANG Ruixiao;TANG Chuanyao;LIU Lehua;LUO Zongqiang;ZHANG Weiwen(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641

出　　处：《特种铸造及有色合金》2024年第6期808-813,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52074131)。

摘　　要：采用金属型重力铸造及挤压铸造工艺,在空冷和快冷方式下分别制备了不同Fe含量的Al-9Si-2Cu合金,研究了合金的微观组织特征、力学性能及导热性能。结果表明,75 MPa挤压压力、快速冷却条件下及Fe含量在0.2%~1.2%范围变化时未改变合金中富Fe相的种类,均为β-Al5FeSi相,但快速冷却和挤压压力均降低了合金中β-Fe含量,导致晶格畸变加剧,降低了合金的热导率。75 MPa挤压铸造及快冷条件下,Al-9Si-2Cu-0.2Fe合金的综合力学性能及导热性能最优,抗拉强度、伸长率和热导率分别为261 MPa、14.1%和142 W/(m·K)。A series of Al-9Si-2Cu alloys with different Fe contents were prepared by metal mould gravity casting and squeeze casting in air cooling and rapid cooling,respectively,and microstructure,mechanical and thermal properties of the alloys were investigated.The results indicate that the types of Fe-rich phases in the alloy remain unchanged under extrusion pressure of 75 MPa and rapid cooling condition with Fe content ranging from 0.2%~1.2%,which are all β-Al5FeSi phases,while the content ofβ-Fe in the alloy is reduced,resulting in the aggravation of lattice distor⁃tion and reduction of thermal conductivity.Under the conditions of 75 MPa squeeze casting and rapid cooling,the mechanical properties and thermal conductivity of Al-9Si-2Cu-0.2Fe alloy are optimal,where the tensile strength,elongation and thermal conductivity reach 261 MPa,14.1%and 142 W/(m·K),respectively.

关 键 词：AL-SI-CU合金 挤压铸造 富Fe相 力学性能 导热性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]