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研究Al5TiB、RE对Mg 8Zn 4Al 0 .3Mn铸造镁合金显微组织、时效过程的影响。结果表明 :加入Al5TiB的Mg 8Zn 4Al 0 .3Mn合金的显微组织主要由Mg相、 (Al2 Mg5Zn2 )相、τ(Mg3 2 (Al,Zn) 4 9)相组成。晶粒大小可由 12 0～ 13 0 μm减少到 3 0～ 40 μm。加入RE的Mg 8Zn 4Al 0 .3Mn xRE合金的显微组织主要由Mg相、 (Al2 Mg5Zn2 )相、τ(Mg3 2 (Al,Zn) 4 9)相和Mg3Al4Zn2RE相组成。晶粒大小由 12 0～ 13 0 μm减少到 40～ 5 0 μm。合金的显微硬度值随RE加入量的增加而增加。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后减小的变化规律 ,而含RE元素合金的析出相形成激活能则随RE元素加入量的增大而增大。
The effect of Al5TiB, RE on the microstructure and aging process of Mg 8Zn 4Al0.3Mn cast magnesium alloy was studied. The results show that the microstructure of Mg 8Zn 4Al 0. 3Mn alloy with Al 5 TiB is mainly composed of Mg phase, (Al 2 Mg 5 Zn 2) phase and τ (Mg 3 2 (Al, Zn) 4 9) phase. The grain size can be reduced from 12 0 ~ 13 0 μm to 30 ~ 40 μm. The microstructure of RE-doped Mg 8Zn 4Al 0 .3Mn xRE alloy mainly consists of Mg phase, (Al 2 Mg 5 Zn 2) phase, τ (Mg 3 2 (Al, Zn) 4 9) phase and Mg 3 Al 4 Zn 2 RE phase. The grain size decreases from 12 0 ~ 13 0 μm to 40 ~ 50 μm. The microhardness of the alloy increased with the addition of RE. With the increase of Ti content in the alloy, the activation energy of the precipitation phase of the alloy increases first and then decreases, while the activation energy of precipitation phase of RE-containing alloy increases with the RE addition amount Increase.