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.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
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)
关键词
显微组织
室温力学性能
铸造镁合金
固溶处理
断口
Microstructure, Mechanical Properties at Room Temperature, Cast Mg Alloy, Solid Solution, Fracture Morphology
作者简介
杨光昱，男，1967年出生，博士研究生，西北工业大学材料科学与工程学院，西安（710071），电话：029—88494276，E-mail：seniorygy.strdent@sina．com
