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采用金相显微分析和DSC分析了Mg 8Zn 4Al 0.3Mn xRE合金时效析出过程及其动力学,结果表明,未添加RE元素的Mg 8Zn 4Al 0.3Mn合金的时效析出过程为:过饱和固溶体→细小弥散析出相→再结晶软化和析出相的聚集长大;添加RE元素的Mg 8Zn 4Al 0.3Mn合金的时效析出过程为:过饱和固溶体→细小弥散析出相→析出相的聚集长大.人工时效后,与未加RE的合金相比,合金2,3,4显微硬度峰值提高分别达5.6%,9%,13.4%;随着RE元素含量的增加,合金的析出相形成激活能呈逐渐增大的变化规律.
The precipitation process and kinetics of Mg 8Zn 4Al 0.3Mn xRE alloy were analyzed by metallographic analysis and DSC. The results show that the aging process of Mg 8Zn 4Al 0.3Mn alloy without RE is as follows: supersaturated solid solution → fine dispersion Phase → recrystallization and softening and aggregation of the precipitated phase. The aging process of the Mg 8Zn 4Al 0.3Mn alloy containing RE element is: the supersaturated solid solution → finely dispersed precipitates → the aggregation and growth of precipitates. After artificial aging, Compared with the alloy without RE, the microhardness of alloy 2, 3, 4 increased by 5.6%, 9%, 13.4% respectively. With the increase of RE content, the activation energy of precipitated phase increased gradually The law of change.