Fe-Pd-Co三元系相平衡的实验研究  

Experimental studyon phase equilibria in Fe-Pd-Co system

作　　者：张旭 吴青 温尊弘 蒋敏 ZHANG Xu;WU Qing;WEN Zunhong;JIANG Min(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819

出　　处：《中国体视学与图像分析》2024年第3期186-193,共8页Chinese Journal of Stereology and Image Analysis

基　　金：云南省重大科技专项贵金属材料专业数据库建设及应用示范(202002AB080001-1-3)

摘　　要：Fe-Co合金具有高饱和磁性和高居里温度,加入Pd可改善合金的磁晶各向异性,有望获得更佳的磁性材料。然而Fe-Pd-Co相图研究十分有限,且Fe-Pd与Co-Pd低温下的有序-无序转变和溶解度间隙尚不够完善,限制了合金的研究与开发。为此本文采用三元扩散偶法,利用电子探针微区成分分析、扫描电子显微镜和能量色散光谱等技术,系统研究Fe-Pd与Co-Pd二元系700℃以下温度的相平衡,进而构建Fe-Pd-Co三元系500℃和700℃等温相图。依据该结果,本文修正了Fe-Pd相图中的FePd和FePd_(3)有序相,实验首次确定了Co-Pd体系的溶解度间隙,并阐明了Fe-Pd-Co三元合金的相平衡和相转变,为相关合金开发设计提供了理论依据。Fe-Co alloys have high saturation magnetization and high Curie temperatures,while the addition of Pd can improve the magnetocrystalline anisotropy of the Fe-Co alloys,which is expected to obtain better magnetic materials.However,the study on the phase diagrams of the Fe-Pd-Co ternary alloys is very limited,and the order-disorder transitions in the Fe-Pd system as well as the miscibility gap in the Co-Pd system at lower temperatures are still uncertain,which limits the development of the Fe-Pd-Co alloys.In this study,the phase equilibria of the Fe-Pd and Co-Pd alloys below 700℃was systematically investigated by using the diffusion triple approach,electron probe microanalysis(EPMA),scanning electron microscopy(SEM),and energy dispersive spectroscopy(EDS),and then the isothermal sections of the Fe-Pd-Co ternary system at both 500℃and 700℃were constructed.As a result,the Fe-Pd and Co-Pd binary phase diagrams have been reevaluated,with a particular focus on the FePd and FePd3 phases in the Fe-Pd system,as well as the miscibility gap in the Co-Pd system.Based on this,the phase equilibria and phase transformations of the FePd-Co alloys have been more thoroughly elucidated.These findings hold significant importance for the advancement and design of the Fe-Pd-Co ternary alloys.

关 键 词：Fe-Pd-Co 相图 有序-无序转变 溶解度间隙 

分 类 号：TG146.3[一般工业技术—材料科学与工程]