Fe_(40—45)Cr_(30—35)Co_(20—25)MO_(0—4)Zr_(0—2)合金微观结构对矫顽力的影响

Effect of microstructure on the coercivity of Fe_(40—45)Cr_(30—35)Co_(20—25)MO_(0—4)Zr_(0—2) alloy

研究了高矫顽力型FeCrCo合金的磁性和微观结构.实验结果表明,适当的合金成分及热处理条件可以明显提高FeCrCo合金的矫顽力.通过透射电镜、x射线衍射等手段得出结论主体元素含量的提高和微量元素的掺杂可以有效地控制相的组成,磁场热处理导致强磁性相和弱磁性相的分离,回火后形成起磁硬化作用的调幅结构.该调幅结构中较大的两相成分差有利于提高FeCrCo合金的矫顽力.

We have studied the magnetic properties, microstructure, and mechanical properties of a high-coercivity FeCrCo alloy. Based on the experiments, the high-coercivity can be obtained by selecting suitable composition and heat treatment process. According to the TEM and XRD results, we drew a conclusion that the main element and the minor metallic dopants control effectively the conformation of phases. Thermomagnetic treatment induces the separation of the ferromagnetic and paramagnetic phases, and a spinodal structure forms that results in magnetic-hardening. The large composition contrast between the two phases could improve the coercivity of the FeCrCo alloy obviously.