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-x Fe Alloy
张瑞啸 1汤传尧 1刘乐华 1罗宗强 1张卫文1
作者信息
- 1. 华南理工大学机械与汽车工程学院,广州 510641
- 折叠
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).
Abstract
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 of β-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Key words
Al-Si-Cu Alloy/Squeeze Casting/Fe-rich Phases/Mechanical Properties/Thermal Properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据