埃林瓦合金中γ′相沉淀的穆斯堡尔效应研究

THE PRECIPITATION OF γ′ PHASE IN ELINVAR ALLOY BY MOSSBAUER EFFECT

测量了淬火、回火和冷变形状态下Ni42CrTi埃林瓦合金的穆斯堡尔谱,并由谱计算了内场分布曲线P(H).实验所得的P(H)曲线的分布是很宽的,并可分解为三个高斯分布的曲线,代表了铁原子的三种不同的择优组态.内场的变化可归因于合金中γ’相的沉淀,后者导致了铁原子近邻环境的变化.比较P(H)曲线上不同内场处几率峰下的相对面积,可以得出合金在不同状态下的γ’相的相对量.此外,穆斯堡尔谱的组分的强度比表明了磁矩的择优取向的程度.

The Mossbauer spectra of Ni42CrTi Elinvar alloy in quenching, aged and cold-working states are measured respectively. On the basis of the spectra, the distributions of internal fields are calculated. The experimental P(H) curves spread widely and are decomposed into three Gaussian curves, which represent three preferential configurations of iron atoms. The variation in internal fields can be referred to the precipitation of γ′ phase in the alloys, which results in the variation in the neighbouring environment of iron atoms. Comparing the relative areas under the probability peaks at different internal fields in P(H) curves, the relative amounts of γ phases in different states of alloys can be deduced. In addition, the intensity ratio of the components of Mossbauer spectrum indicates the extent of preferential orientation of magnetic moments.