Mg-12Zn-xCa合金T6处理后的组织与硬度

Microstructure and hardness of Mg-12Zn-xCa alloy after T6 treatment

研究了铸态Mg-12Zn-xCa(x=0、1、2、3)合金T6处理后的组织与硬度。结果表明,铸态Mg-12Zn-xCa合金经T6处理后,组织中α-Mg相由枝晶变为等轴晶且细化,硬度提高。随着Ca含量增加,T6处理Mg-12Zn-xCa合金组织细化,硬度提高,但Ca含量超2%时,组织出现枝晶化,硬度降低。

Microstructure and hardness of the as-cast Mg-12 Zn-xCa(x=0,1,2,3)alloys after T6 treatment were studied.The results show that after T6 treatment,theα-Mg phase in the alloys changes from dendritic crystals to equiaxed grains and is refined,the hardness of the alloy is increased obviously.With the increase of Ca content,the microstructure of T6 treated Mg-12 Zn-xCa alloys is refined and the hardness is increased,but when the content of Ca is more than 2%,dendritic crystals appear in the structure and the hardness decreases.