利用电子显微镜薄膜透射技术,选区电子衍射和X射线衍射对Ni-Fe-Mo合金和Ni-Fe-Jb合金的显微组织进行了比较;对Ni-Fe-Nb合金在不同热处理制度下组织结构对磁性能的影响进行了研究。其结果如下: 1.两类合金均存在调幅结构。Ni-Fe-Nb合金调幅区域大,而且衬度明显。随着调幅面积的增大,硬度增高,磁性能下降.解释了Ni-Fe-Nb合金硬化的原因。 2.钼和铌原子的加入,降低了Ni_3Fe有序度,使合金得以保持适宜的有序度,获得高导磁性。在Ni-Fe-Nb合金中发现面心立方(有序)Ni_3Nb(γ′)的预沉淀相,与基体完全共格,促进了调幅结构的形成,使基体强化。
An investigation of the structures of Ni-Fe-Mo and Ni-Fe-Nb alloys has beencarried out by means of TEM supplemented by electron diffraction and X-ray dif-fraction analysis. The results obtained have been correlated with magnetic proper-ties as follows: Both alloys showed modulated structures, in which the Ni-Fe-Nb alloy beingcoarser and more predominant. As the proportion of modulated structures increases,the hardness of the alloy also increases, but vice versa in the case of its mag-netic permeability. The introduction of solute atoms Mo and Nb would lower the degree of or-dering in Ni_3Fe alloy, but fortunately only certain degree of ordering was sufficientto yield conditions for high permeability. A preprecipitating phase possessing thefcc (ordered) Ni_3Nb (γ′) structure and being coherent with the matrix,was observ-ed in the Ni-Fe-Nb alloy. This phase appears to promote the formation of modu-lated structures and exert a strengthening effect on matrix.
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