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研究了Al5TiB加入量对Mg 8Zn 4Al 0 .3Mn铸造镁合金时效过程的影响。结果表明 ,未加Al5TiB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Al5TiB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。固溶处理后 ,与未加Al5TiB的合金 1# 相比 ,合金 2 # 、3# 、4 # 显微硬度值分别提高了 2 .8%、6 .8%、9.1% ;人工时效后 ,与未加Al5TiB的合金 1# 相比 ,合金 2 # 、3# 、4 # 显微硬度峰值分别提高了 9%、11.2 %、5 .2 %。随着Ti元素在合金中含量的增加 ,合金的析出相形成激活能呈先增大而后减小的变化规律。
The effect of Al5TiB addition on the aging process of Mg 8Zn 4Al0.3Mn magnesium alloy was studied. The results show that the aging process of the Mg 8Zn 4Al 0. 3Mn alloy without Al 5 TiB is as follows: supersaturated solid solution → finely dispersed precipitates → recrystallization softening and aggregation of the precipitated phase; the addition of Al 5 Ti 3 Mg 8 Zn 4 Al 0.3 Mn alloy The time-dependent precipitation process is: supersaturated solid solution → finely dispersed precipitates → precipitates grow up. After solution treatment, the microhardness values of 2 #, 3 # and 4 # of the alloy increased by 2.8%, 6.8% and 9.1% respectively compared with that of the alloy without addition of Al5TiB. After artificial aging, Compared with alloy # 1 without Al5TiB, the peak values of microhardness of alloy # 2, # # and # 4 increased by 9%, 11.2% and 5.2% respectively. With the increase of Ti content in the alloy, the activation energy of the precipitated phase increases first and then decreases.