Al—5Fe—2Ni合金析出相的Mossbauer谱

MOSSBAUER SPECTRA OF THE PRECIPITATE IN Al-5Fe-2Ni ALLOY

用Ｍｏｓｓｂａｕｅｒ谱学和ＸＲＤ方法研究了快速凝固Ａｌ－５Ｆｅ—２Ｎｉ（原子由分数）合金的析出相．结果表明，析出相为三元化合物Ａｌ＿９Ｆｅ＿ｘＮｉ＿（２－ｘ）（０＜ｘ＜２），属于单斜晶系，晶格参数α＝０．８５８ｎｍ，ｂ＝０．６３１ｎｍ，ｃ＝０．６２１ｎｍ，β＝９４．８°它的Ｍｏｓｓｂａｕｅｒ谱为一套双线，同质界能移位ＩＳ＝０．１２ｍｍｓ（－１），四极分裂ＱＳ＝０．３２ｍｍｓ（－１）线宽Ｆ＝０．２６ｍｍｓ（－１）在８００Ｋ以上热处理时，该相的成分由急冷态的Ａｌ＿９Ｆｅ＿（１．４３）－Ｎｉ＿（０．５７）向平衡相Ａ１＿９ＦｅＮｉ过渡，但晶格参数和Ｍｏｓｓｂａｕｅｒ参数没有明显变化．

The precipitate in rapidly solidified Al-5Fe-2Ni alloy has been investigated by means of Mossbauer spectroscopy and X-ray diffraction.It has been identified as a ternary compound Al9FexNi(2-x)(0 < x <2) with monoclinic crystal lattice and parameters a = 0.858nm,b = 0.631nm, c = 0.621nm,β=94.8.The Mossbauer pattern of Al9 Fex Ni(2-x).phase is a set of double lines with IS=0.12mm / s,QS =0.32mm / s and = 0.26mm / s.The chemical composition of precipitate is modified to equilibrium phase Al9 FeNi from Al9 Fe 1.43 Ni0. 57 of the rapid cooling state during heat treatment at above 800K,but the crystal parameters and Mossbauer parameters are not evidently modified.