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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 kind of Al-6.4Cu-0.4Mn high strength and toughness extruded aluminum alloy was studied by means of OM, SEM, TEM and room temperature mechanical properties test. At the same time, The load wheel hub was prepared by squeeze casting and conventional casting, and the microstructure and properties of the alloy under squeeze casting and conventional casting were comparatively studied. The results show that solidification zone, solid-liquid zone, liquid-solid zone and liquid zone are formed in the solidification zone during the forming process of the new alloy. The anti-segregation of the microstructure after squeeze casting of the new alloy is serious. The equiaxed degree Which is composed of foundry and deformed structure. After extrusion-forming of the new alloy, the tensile strength and elongation of the new alloy are significantly better than that of the conventional casting process, reaching 468 MPa and 16.2% respectively.