Al-Fe-Si合金基体及强化相Al_(12)(Fe,X)_3Si价电子结构分析  

Analysis of Valence Electron Structures of Matrix and Precipitated Phase Al_(12)(Fe,X)_3Si in Al-Fe-Si Alloy

作　　者：屈华[1] 刘伟东[1] 刘玉颖 

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]锦州阳光能源有限公司,辽宁锦州121001

出　　处：《稀有金属》2011年第4期607-612,共6页Chinese Journal of Rare Metals

基　　金：辽宁省自然科学基金项目(20031083);辽宁省教育厅高校重点实验室支持计划项目(LS2010082)资助

摘　　要：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。According to the empirical electron theory of solid and molecules,the valence electron structures（VESs） of the matrix and the strengthening phases of Al12Fe3Si and Al12（Fe,X）3Si in Al-Fe-Si alloy were calculated.The relationships between the VESs and alloy strengthening and the stability of alloy phases and the effects of alloying element X on the stability of the strengthening phases were discussed.The results showed that the values of nA of Al12Fe3Si and Al12（Fe,X）3Si increased by 248% and 208%~231%,and the drag force of dislocation movement increased 2.48 times and 2.08~2.31 times compared with the α-Al matrix separately,the effect of solution strengthening of solution atoms was weaker than that of the strengthening phases of Al12Fe3Si and Al12（Fe,X）3Si from the view of the VES parameter nA of the alloy phases.The addition of alloying element V,Cr,W,Mo and Mn changed the VES of Al12Fe3Si and made its number of atom state group σN increased by 2 orders of magnitude,so it made the stability of the alloy phases increased and then delayed the coarsening speed.The order for the addition of the alloying elements of the effects on the stability of Al12Fe3Si was Cr（Mn）→W（Mo）→V.

关 键 词：Al-Fe-Si合金 Al12Fe3Si 价电子结构 强化 稳定性 

分 类 号：TG111.1[金属学及工艺—物理冶金]