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基于EET理论,计算了Al-Fe-Si合金基体与强化相Al12Fe3Si,Al12(Fe,X)3Si的价电子结构,探讨了价电子结构与合金强化、合金相稳定性的关系及合金元素X对强化相稳定性的影响。结果表明:与基体α-Al相比,强化相Al12Fe3Si,Al12(Fe,X)3Si的nA值分别增强了248%,208%~231%,位错运动阻力分别增大2.48倍和2.08~2.31倍,从合金相价电子结构参数nA看,溶质原子固溶强化作用弱于析出相的强化作用;合金元素V,Cr,W,Mo,Mn的加入改变了Al12Fe3Si的价电子结构,使其原子状态组数σN增加了2个数量级,使合金相的稳定性增强,进而延缓了粗化速度;V,Cr,W,Mo,Mn对Al12Fe3Si相稳定性影响的强弱顺序为Cr(Mn)→W(Mo)→V。
Based on EET theory, the valence electron structures of Al-Fe-Si alloy and Al12Fe3Si and Al12 (Fe, X) 3Si were calculated and the relationship between the valence electron structure and the strengthening of alloy and the stability of alloy phase were discussed. Strengthen the influence of phase stability. The results show that the nA values of reinforced Al12Fe3Si and Al12 (Fe, X) 3Si increase by 248% and 208% ~ 231%, respectively, and the displacement resistance increases by 2.48 and 2.08 ~ 2.31 Times. From the nA of the electronic structure of the alloy, the solid solution strengthening effect of solute atoms is weaker than that of precipitation phase. The addition of alloying elements V, Cr, W, Mo and Mn changed the valence electron structure of Al12Fe3Si, The number of state groups σN increased by two orders of magnitude, which enhanced the stability of the alloy phase and slowed down the rate of coarsening. The order of the strength of V, Cr, W, Mo and Mn on the phase stability of Al12Fe3Si was Cr (Mn) → W (Mo) → V.