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利用差热分析仪、光学显微镜、扫描电镜、能谱仪、X射线衍射仪、显微硬度计和力学万能试验机研究了ZC62铸造镁合金的铸态与不同均匀化热处理下的显微组织和力学性能的变化。结果表明:ZC62合金铸态组织的成分偏析严重,合金元素Mg、Zn和Cu在晶界处富集,区域偏析严重;经过均匀化热处理后合金组织中的非平衡相大部分溶进基体α-Mg中,各组元分布趋于均匀;ZC62铸造镁合金最佳的均匀化工艺为450℃+12 h,可获得232 MPa的抗拉强度,伸长率达约13.84%。
Using differential thermal analyzer, optical microscope, scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction, microhardness tester and mechanical universal testing machine to study the microstructure of ZC62 cast magnesium alloy and different homogenization heat treatment Changes in mechanical properties. The results show that the as-cast microstructure of ZC62 alloy is seriously segregated, and the alloying elements Mg, Zn and Cu are enriched in the grain boundaries and the segregation is serious. After the homogenization heat treatment, most of the unbalanced phases in the alloy are dissolved into the matrix α- Mg, the distribution of each component tends to be uniform. The best homogenization process of ZC62 cast magnesium alloy is 450 ℃ + 12 h, tensile strength of 232 MPa can be obtained and the elongation reaches about 13.84%.