锻压技术

时效处理工艺对Mg-12Zn-2Ca合金组织与性能的影响

英文标题：Influence of aging treatment on microstructure and properties of Mg-12Zn-2Ca alloy

作者：王博

单位：渤海船舶职业学院

分类号：TG146.2

出版年,卷(期):页码：2020,45(9):177-180

摘要：

通过对Mg-12Zn-2Ca合金进行不同的T6处理（固溶+人工时效）工艺，并观察显微组织和测试布氏硬度，研究了时效处理工艺对Mg-12Zn-2Ca合金组织与性能的影响。试验结果表明：Mg-12Zn-2Ca合金在380 ℃下固溶20 h后，在180 ℃下进行不同时间的时效处理，随着时效时间的增加，合金的硬度值出现急剧上升，在时效12 h时达到阶段高点，之后在相对较小的区间波动，至96 h时达到最高点，随后出现明显回落。因此，Mg-12Zn-2Ca合金在380 ℃下固溶20 h后，在时效温度为180 ℃下的最佳时效时间为96 h，合金硬度到达最高值，为89.7 HBW，其组织为等轴晶α-Mg基体相以及在α-Mg相之间与α-Mg相内部弥撒分布着的Mg5Zn13Ca2与Mg6Zn3Ca2等第二相。

Mg-12Zn-2Ca magnesium alloy was conducted by different T6 treatment processes (Solution and artificial aging), and its microstructure and hardness were tested. Then, the influences of aging treatment process on microstructure and properties of Mg-12Zn-2Ca alloy were studied. The results show that the hardness of Mg-12Zn-2Ca alloy increases sharply with the increasing of aging time when it is aging treated for different times after solid solution of 380 ℃×20 h, and it reaches the stage high point when aging for 12 h. After that, it fluctuates in a relatively small interval and reaches its highest point when aging for 96 h; then it drops significantly. Thus, when Mg-12Zn-2Ca alloy is treated under 380 ℃×20 h for solid solution and 180 ℃×96 h for aging, the hardness of alloy gets its maximum value of 89.7 HBW, and its microstructure is equiaxed α-Mg matrix phase and the second phases such as Mg5Zn13Ca2 and Mg6Zn3Ca2 which are distributed between α-Mg phase and inside α-Mg phase。

基金项目：

王博（1981-），男，硕士，副教授 E-mail：wangbo411@163.com

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