【摘要】 用机械合金化方法制备了Ｆｅ１００－ｘＮｉｘ系超细粉末（其中ｘ＝７５，４５，３５，３２．５，３０）。对各样品进行了Ｘ－ｒａｙ衍射谱测量，用Ｓｃｈｅｒｅｒ方法测量了晶粒尺寸。用最小二乘法计算了随Ｎｉ含量ｘ的减少样品晶格常数的变化以及随ｘ的减少样品的结构变化。发现当ｘ＝７５，４５时，样品成为以Ｎｉ为溶剂Ｆｅ为溶质的面心立方固溶体，随着Ｆｅ含量不断增加，Ｆｅ－Ｎｉ合金中除了Ｎｉ型面心立方结构外，还存在α－Ｆｅ体心立方及少量的γ－Ｆｅ面心立方相。当ｘ＝３０也就是Ｆｅ的含量达到７０％时，合金表现为α－Ｆｅ体心立方结构和γ－Ｆｅ面心立方结构的复相ＦｅＮｉ固溶体。讨论了γ－Ｆｅ相出现的机理更多还原

【Abstract】 Ultrafine powder Fe100- x Ni x was prepared by means of the mechanical alloying ( x=75,45,35,32.5,30) .The X-ray diffraction spectra were measured with the method of Scherrer.The changes of lattice constant were measured with the decreasing of the contents of Ni by the minimum second multiplication.It was observed that when x= 75,45 the samples present F.C.C structure of Ni,but when Fe increased there was the B.C.C structure of -Fe,and a bit F.C.C structure of -Fe besides the F.C.C structure of Ni.When x= 30, that was to say the contents of Fe were 70%,the samples present B.C.C of -Fe and F.C.C of -Fe complex phase structure,instead of the F.C.C phase of Ni structure.And the mechanism was further discussed.更多还原