ZA53镁合金的砂型铸造组织和力学性能研究  

Microstructure and Mechanical Properties of ZA53 Mg Alloy in Sand Casting

作　　者：杨光昱[1] 介万奇[1] 郝启堂[1] 

机构地区：[1]西北工业大学

出　　处：《特种铸造及有色合金》2005年第11期653-655,共3页Special Casting & Nonferrous Alloys

基　　金：国家973计划资助项目(G2000067202)

摘　　要：研究发现砂型铸造镁合金ZA53的主要相组成为δMg基体相和τ[Mg32(Al,Zn)49]化合物相,τ相以半连续网状沿δ相晶界分布。对ZA53合金进行的固溶处理试验发现,在335℃固溶17h淬火后,合金室温抗拉强度和塑性得到大幅提高。在343℃固溶17h淬火后,合金组织完全转变为单相固溶体,合金的室温力学性能较好,σb=245MPa,伸长率为12%,合金的拉伸断口形貌由混合型断口转变为韧性断口。As-cast microstructure of ZA53 Mg alloy in sand casting is mainly composed of δ-Mg matrix phase and τ[Mg_ 12(Al,Zn)_ 49]compound, in which semi-continuous network τ phase is distributed along δ-Mg matrix phase boundary. Tensile strength at room temperature and plasticity of the quenched alloy can be improved remarkably after solid solution at 335 ℃ for 17 hours. Mechanical properties of the quenched ZA53 alloy is σ_b =245 MPa and δ= 12% and the fracture morphology transforms from mixed fracture to tough fracture due to microstructure fully transforming single solid solution phase after solid solution at 343℃for 17 h.

关 键 词：显微组织 室温力学性能 铸造镁合金 固溶处理 断口 

分 类 号：TG27[金属学及工艺—铸造]