A new Al-6.4Cu-0.4Mn medium strength aluminum alloy was investigated by optical microscope（OM）

scanning electron microscope（SEM）

transmission electron microscopy（TEM）

tensile testing and electric conductivity testing.The loading wheel hub of the alloy prepared was produced by squeezing casting and conventional casting process to analyze comparatively microstructure and mechanical properties of the alloy at different casting process.The results reveal that the solidification state of the new alloy is composed of solid phase zone

solid-liquid phase zone

liquid-solid zone and liquid zone.Microstructure of the squeezing casting new alloy consists of as-cast and deformation structure with serious inverse segregation and high level isometric crystal.Tensile test indicates that strength and elongation of the squeezing casting Al-6.4Cu-0.4Mn aluminum alloy are increased obviously after solution and aging treatment process compared with those of conventional casting process

reaching 468 MPa and16.2%

respectively.