Microstructure,Mechanical and Thermal Properties of Al-9Si-2Cu-x Fe Alloy
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.
NETL
NSTL
万方数据
