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研究了均匀化处理温度和时间对铸态Mg-4Sn-1Zn合金显微组织及力学性能的影响。结果表明,铸态Mg-4Sn-1Zn合金中存在严重的枝晶偏析,合金中分布着大量粗大相,主要为Mg2Sn和MgSnZn共晶相。在均匀化处理过程中,温度对合金成分均匀化效果的影响更大,而时间的影响相对较小。合金经过410℃×12h均匀化处理后,铸态组织中的粗大相全部溶入基体中,达到了最佳的均匀化效果,此时合金的显微硬度(HV)为60。因而确定Mg-4Sn-1Zn合金的最优均匀化制度为410℃×12h。
The effects of homogenization temperature and time on the microstructure and mechanical properties of as-cast Mg-4Sn-1Zn alloy were investigated. The results show that there is a serious dendritic segregation in the as-cast Mg-4Sn-1Zn alloy. There are many coarse phases distributed in the alloy, mainly Mg2Sn and MgSnZn eutectic phases. In the homogenization process, the effect of temperature on the homogenization of the alloy composition has a greater impact, while the impact of time is relatively small. After homogenization of the alloy at 410 ℃ for 12h, the coarse phase in the as-cast microstructure all dissolved into the matrix to achieve the best homogenization effect. At this time, the microhardness (HV) of the alloy was 60. Therefore, the optimal homogenization system of Mg-4Sn-1Zn alloy was determined to be 410 ℃ × 12h.