【摘要】 对普通铸造制备的高硅含量Mg-9Al-6Si镁合金进行了均匀化处理,然后进行了1道次正挤压和8道次往复挤压,以探讨不同挤压工艺对其组织与压缩性能的影响。结果表明:正挤压对该镁合金中Mg₂Si相的破碎、细化效果不明显,而往复挤压对Mg₂Si相有很好的破碎、细化作用;Mg₂Si相的细化可提高镁合金的压缩性能;合金往复挤压8道次后的抗压强度、压缩屈服强度和硬度分别为494.5MPa,344.1MPa和149.4HV,而正挤压后分别为465.4MPa,207.6MPa和130.7HV;两者压缩破坏均为沿轴向的脆性断裂。更多还原

【Abstract】 High-silicon Mg-9Al-6Si aluminum alloy prepared by conventional casting was homogenized,and then treated by one-pass forward extrusion and eight-pass reciprocating extrusion,respectively.The effects of different extrusion techniques on microstructure and compression property were investigated.The results show that forward extrusion had no obvious effect on fragmentation and refinement of the Mg₂Si phase in the magnesium alloy, while reciprocating extrusion had obvious effect.Mg₂Si phase refinement could improve the compression property of the alloy.The compression strength,compression yield strength and hardness of the alloy eight-pass reciprocating extrusion were 494.5 MPa,344.1 MPa and 149.4 HV respectively,which were 465.4 MPa,207.6 MPa and0 130.7 HV.The compression failure of both the alloys was brittle fracture along the axial direction.更多还原