Magnetic Property of Nonequilibrium Solid Solution of psi Phase in Rapidly Solidified High-Carbon Iron Alloy

获得psi相的最佳化学成分为3%C-10%Cr-10%Mo或3%C-10%Cr-3%Si，余量为Fe。采用相同成分的合金，通过提高凝固速度，获得非晶相。psi相的电阻率和相稳定性对温度的依赖性与非晶相相似。结果还表明，在其他晶相中，psi相的原子局域排列与非晶相的原子局域排列非常接近，导致了两种相具有相似的电阻率和相稳定性，尽管两种相具有相似性，但psi相的磁性能与非晶相不同。在低于500 K（分解的临界温度）的长时间热处理后，在psi相中诱导出有序结构。我们准备了三种标本，即，非晶相、固溶体的psi相和有序态的psi相，测量B-H曲线。在有序psi相的磁化强度的斜率和饱和表现出显着高的值相比，非晶相。该相作为软磁材料比非晶相更有用。

The optimum chemical compositions for obtaining the psi phase were determined to be 3%C-10%Cr-10%Mo or 3%C-10%Cr-3%Si and balanced iron. Alloys with the similar compositions were also used to obtain amorphous phase by increasing solidification rate. Temperature dependence of electrical resistivity and phase stability upon heating of the psi phase are similarto that of the amorphous phase. It is also shown that the local atom arrangement of the psi phase is rather close to that of the amorphous phase among the other crystalline phases, resulting in the similar resistivity and phase stability of the both phase.Regardless of the similarity of the both phase, the magnetic property of the psi phase is different from the amorphous phase. After heat-treatment for a long period below 500K,which is a critical temperature for decomposition, an ordered structure is induced in the psi phase. We prepared three kinds of specimens, i.e., the amorphous phase, the psi phase of solid solution, and the psi phase of ordered state, to measure the B-H curve. The slope and saturation of the magnetization in the oredered psi phase exhibit markedly high values compared with the amorphous phase. The phase is more useful as a soft-magnetic materials than the amorphous phase.