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基于EET理论,采用平均原子模型计算了Al的质量分数为0、2%、4%、6%、8%、10%的Mg-Al合金晶胞的电子结构参数统计值n′A;利用n′A获得了一组表征合金强化效果的固溶强化系数SMg-Al,其数值分别为1、1.008 73、1.017 47、1.026 29、1.035 11、1.043 94;研究了电子结构参数σN与合金稳定性的关系。结果表明:Al原子的加入,增大了Mg晶胞中最强共价键的n′A值和σN值,提高了原子间的结合力及基体的稳定性,起到了固溶强化作用;SMg-Al值随溶质含量的增加单调递增,合金的固溶强化效果越好。
Based on the EET theory, the electronic structure parameter n’A of Mg-Al alloy cells with mass fraction of Al of 0, 2%, 4%, 6%, 8% and 10% ’A obtained a group of solid solution strengthening coefficient SMg-Al characterizing the strengthening effect of the alloy, the values were 1,1.008 73,1.017 47,1.026 29,1.035 11,1.043 94; electronic structure parameters σN and alloy stability Relationship. The results show that the addition of Al atoms increases the n’A value and the σN value of the strongest covalent bond in the Mg unit cell, increases the binding force between atoms and the matrix stability, and plays a role in solid solution strengthening. SMg -Al value increases monotonously with the increase of solute content, the better the solution strengthening effect of the alloy.