挤压铸造Al-6.4Cu-0.4Mn合金轮毂的组织与性能  

Microstructure and Properties of Squeezing Casting Al-6.4Cu-0.4Mn Alloy

作　　者：高文林[1,2] 孙进宝[1,2] 王海龙[1,2] 罗传彪[1,2] 孙刚[1,2] 王长顺[3] 李宏伟[3] 陆政[1,2] Gao Wenlin Sun Jinbao Wang Hailong Luo Chuanbiao Sun Gang Wang Changshun Li Hongwei Lu Zheng(Beijing Institute of Aeronautical Materials Beijing Engineering Research Center of Advanced Aluminum Alloys and Application Beijing North Vehicle Group Corporation)

机构地区：[1]北京航空材料研究院 [2]北京市先进铝合金材料及应用工程技术研究中心 [3]北京北方车辆集团有限公司

出　　处：《特种铸造及有色合金》2016年第10期1069-1074,共6页Special Casting & Nonferrous Alloys

摘　　要：通过金相组织观察(OM)、扫描电镜(SEM)、透射电镜(TEM)、室温力学性能测试等手段,研究了一种Al-6.4Cu-0.4Mn中强高韧挤压铸造铝合金,同时利用挤压铸造与常规铸造制备了负重轮轮毂,并对比研究了该合金挤压铸造与常规铸造条件下组织、性能的变化情况。结果表明,新合金挤压铸造成形过程中共形成固相区、固液区、液固区以及液体区4个凝固区域;新合金挤压铸造后的显微组织反偏析现象严重,等轴晶程度较高,由铸造组织与变形组织共同组成;新合金挤压铸造成形后经固溶时效热处理,其抗拉强度与伸长率显著优于常规铸造工艺性能,分别达到468 MPa与16.2%。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.

关 键 词：挤压铸造 Al-6.4Cu-0.4Mn铝合金 显微组织 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]