论文部分内容阅读
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
Fe100-xNix ultrafine powders (x = 75, 45, 35, 32.5, 30) were prepared by mechanical alloying. Each sample was subjected to X-ray diffraction spectrum measurement, and the grain size was measured by the Scherer method. The least square method was used to calculate the change in the lattice constant of the sample with decreasing Ni content x and the structural change of the sample as the x decreased. It is found that when x = 75,45, the sample becomes a face-centered cubic solid solution with Ni as solvent and solute with Fe. With the increasing of Fe content, in addition to the Ni-type face-centered cubic structure in the Fe-Ni alloy, α-Fe Body-centered cubic and a small amount of γ-Fe face-centered cubic phase. When x = 30, that is, when the content of Fe reaches 70%, the alloy exhibits a complex FeNi solid solution of α-Fe body-centered cubic structure and γ-Fe face-centered cubic structure. The mechanism of γ-Fe phase is discussed