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基于固体与分子经验电子理论(EET),采用平均原子模型计算了质量分数为4%,10%,15%,20%,25%,30%,32%Cu-Zn合金相结构单元的价电子结构参数统计值nA′,Δρ′,利用n′A,Δρ′计算了表征合金强化效果的固溶强化系数SCu-Zn和界面强化系数SCu-Zn/Cu-Zn,它们的数值分别为0.9925,1.0054,1.0437,1.0868,1.1055,1.1205,1.1208和7.6579,8.5444,10.6675,11.8616,12.4737,10.3345,9.5809,并通过两个强化系数讨论了合金元素Zn对Cu-Zn合金固溶强化、界面强化及合金强度出现拐点现象的影响。结果表明,SCu-Zn值越大,合金固溶强化效果越强;SCu-Zn/Cu-Zn值越大,合金的相界面应力越高,抵抗变形能力越强,界面强化效果越好。当Zn含量小于25%时,SCu-Zn,SCu-Zn/Cu-Zn值均随溶质的增加而单调递增,合金强度的变化趋势与SCu-Zn,SCu-Zn/Cu-Zn值变化相同;当Zn含量大于25%时,随着Zn含量增加,SCu-Zn值增势变缓,SCu-Zn/Cu-Zn值急剧下降,但SCu-Zn/Cu-Zn值降低较SCu-Zn值增加趋势大,它们综合作用表现为合金强度降低。SCu-Zn和SCu-Zn/Cu-Zn共同决定着合金的强化效果,它们的数值愈大,合金强化作用愈强。
Based on the empirical electron theory of solids and molecules (EET), the valence electrons of 4%, 10%, 15%, 20%, 25%, 30%, and 32% The values of structural parameters, nA ’, Δρ’, were calculated using n’A, Δρ ’. The values of SCu-Zn and SCu-Zn / Cu-Zn were 0.9925, 1.0054,1.0437,1.0868,1.1055,1.1205,1.1208 and 7.6579,8.5444,10.6675,11.8616,12.4737,10.3345,9.5809, and discussed by two strengthening factors of alloying elements Zn Cu-Zn alloy solution strengthening, strengthening the interface and the alloy The effect of inflection point appears on strength. The results show that the larger the SCu-Zn value, the stronger the solid solution strengthening effect. The larger the SCu-Zn / Cu-Zn value is, the higher the interface stress of the alloy is and the stronger the deformation resistance is and the better the interface strengthening effect is. When the content of Zn is less than 25%, the values of SCu-Zn and SCu-Zn / Cu-Zn all increase monotonically with the increase of solute. The change trend of alloy strength is the same as that of SCu-Zn and SCu-Zn / Cu- When the content of Zn is more than 25%, the SCu-Zn value increases slowly and the SCu-Zn / Cu-Zn value decreases sharply as the Zn content increases. However, the SCu-Zn / Cu- The trend is large, the combined effect of their performance decreased alloy strength. SCu-Zn and SCu-Zn / Cu-Zn together determine the strengthening effect of the alloy, the greater their value, the stronger the strengthening effect of the alloy.