Microstructure and Magnetic Properties of Undercooled Fe-80at%Ni Alloys
Bulk Fe-g0at%Ni melts were undercooled by using cyclic superheating and glass slag purification technique, and the maximum undercooling 340 K could be achieved. The microstructures of Fe-80at%Ni alloys were observed by means of optical microscope (OM). The phase composition was identified by X-ray diffraction (XRD) analysis. The magnetic properties of Fe-80at% Ni alloys were measured by vibrating sample magnetometer (VSM) with a DC M-H analyzer. The results showed that there was only single γ-(Fe, Ni) phase existing in undercooled Fe-80at%Ni alloys. Two grain refinements and one grain coarsening were observed in the undercooling range from 28 K to 340 K. The first grain refinement could be ascribed to dendrite-remelting, and the second to recrystallization induced by the stress originating from rapid solidification. The grain coarsening could be considered as a result of solid-state grain coalescence. The measurement of soft magnetic properties showed that the grain size D decreases with an increase of undercooling, the maximum Ms is 109.98emu/g, corresponding to minimum grain size 42.9μm or undercooling 210 K, and the coercive force Hc is in proportion to the reciprocal of grain size D-1.
High undercooling Fe-80at Ni alloy Structure Soft magnetic properties
H.Xie G.H.Bai L.Jia E.K.Liu Z.L.Lu
School of Materials Science and Engineering, Xian University of Technology, Xian, 710048, P.R.Chin State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian 7100 School of Materials Science and Engineering, Xian University of Technology, Xian, 710048, P.R.Chin
国际会议
10th International Symposium on Eco-Materials Processing and Design(第10届国际生态材料加工与设计研讨会)
西安
英文
327-330
2009-01-13（万方平台首次上网日期，不代表论文的发表时间）