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利用差热分析仪(DSC)、金相显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)和显微硬度测试仪,对不同的均匀化热处理工艺下铸态ZM61镁合金组织转变和成分均匀化效果进行了表征。并采用求显微硬度方差大小的方法对均匀化过程中的两个重要参数——温度和时间进行了深入探讨。结果表明:铸态ZM61镁合金显微组织中存在严重的枝晶偏析,枝晶间有粗大的呈网状分布的Mg-Zn相,枝晶内部和枝晶臂间也存在大块状化合物;温度是均匀化过程中的主导因素,过度延长保温时间对均匀化作用不大;ZM61镁合金较优的均匀化工艺:330℃×16h+420℃×2h。
The microstructures of as-cast ZM61 magnesium alloy were investigated by differential scanning calorimetry (DSC), optical microscope (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and microhardness tester Changes and compositional homogenization effects were characterized. The two important parameters in the process of homogenization, temperature and time, were discussed in depth by using the method of finding the variance of microhardness. The results show that there are serious dendrite segregations in the microstructure of the as-cast ZM61 magnesium alloy, and the coarse-grained meshed Mg-Zn phase exists between the dendrites. There are also massive compounds inside the dendrite and the dendrite arm. The temperature Is the dominant factor in the process of homogenization. Excessive prolongation of holding time has little effect on homogenization. The better homogenization process of ZM61 magnesium alloy is 330 ℃ × 16h + 420 ℃ × 2h.