ALCHEMI技术测定Cr原子在Fe3Al合金中所占位置的研究

通过对Ｃｒ原子在具有ＤＯ３型结构的Ｆｅ３Ａｌ金属间化合物中所占点阵位置的研究，扼要地论述了ＡＬＣＨＥＭＩ技术的基本原理、实际应用、实验操作和数据分析过程．明确指出，最近几年才发展起来的ＡＬＣＨＥＭＩ技术对于确定添加的合金元素原子在有序晶体中所占位置来说，是一种可靠易行的新型技术．本文研究结果证实，作为合金元素加入到Ｆｅ３Ａｌ金属间化合物中的Ｃｒ原子，占据了本属于Ａｌ原子的位置，含Ｃｒ的Ｆｅ３Ａｌ的分子式可以写成Ｆｅ３（Ａｌ，Ｃｒ）．Ｃｒ原子占据本属于Ａｌ原子的位置后，可在一定程度上阻止Ｆｅ３Ａｌ中的Ａｌ和环境中的水蒸气起反应，从而缓解了Ｆｅ３Ａｌ金属间化合物的环境脆性．

The study of determining Cr atom location in Fe_3Al by ALCHEME

The Prinmple ac aPPliCation of ALCHEMI have ben doribo in the Prcment paper.It has ben shoWn that the new teChnology of ALCHEMI is a useful ac effedve methodfoe determiming the atom location of alloying element in an ordered crystal. The reSultsshoW that the atomS of ailotw element Cr in FesAI intermetallic compoUnod OCCupy thesiteS of Al atomS,the formula for Fe3AI contahag Cr can be written as Fe3(Al,Cr). Cratoms occupying the sites of Al can suppress the chelnital reaction between Al ac themoisture in the air to a certain edment,which results in an obvious reduction for the envi.ronmental embrittlement of Fe3Al.