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In-Situ High Temperature X-Ray Diffraction Study of Structure and Phase Transformation of Nd-fept alloys

Journal of Rare Earths 2005年第6期23卷 724-726页

作者：成钢顾正飞周怀营王仲民邹瑞萍袁松柳 Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Departmentof Information of Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004China School of Materials Science and Engineering University of New South Wales NSW 2052 Australia

The structure and disorder-order transformation of Ndxfe60.5-x pt39.5（x = 0, 0.5, 1.0, 1.5） alloys were investigated in situ by high temperature X-ray diffraction. The results show that the lattice parameter a of disordered γ phase （FCC, Al structure type） and the lattice parameter ratio c/a of ordered γ1 phase （FCT, L10 structure type） increase linearly with increasing Nd concentration, whereas the c/a ratio decreases with increasing temperature. The transition temperature from ordered FCT to disordered FCC decreases with increasing Nd concentration, but for alloys quenched rapidly from γ phase region into ice-water it increases with increasing Nd.

关键词： fe-pt alloys phase transformation high temperature. X-ray diffraction rare earths

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Phase Transformation and Magnetic Properties of Nd_xfe_(60.5-x)pt_(39.5)(x=0, 0.5, 1.0, 1.5) alloys

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Journal of Rare Earths 2007年第1期25卷 84-87页

作者：成钢顾正飞周怀营王仲民袁松柳 Department of Physics Huazhong University of Science and TechnologyWuhan 430074 ChinaDepartment of Information of Materials Science and Engineering Guilin University of Electronic Technology Guilin 541004 China Department of Information of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin 541004 China Department of Physics Huazhong University of Science and TechnologyWuhan 430074 China

The effect of Nd addition on the structure, phase transformation and magnetic properties of fept based alloys was investigated. The results indicated that the transition temperature from ordered FCT to disordered FCC phase decreased with increasing Nd concentration, but for alloys quenched rapidly from the γ phase region into ice-water, it increased with increasing Nd. The Nd element not only effectively reduced the grain size of the ordered phase but also decreased the degree of the ordered phase and refined the grains of the FCC matrix phase. The remanence ratio and coereivity of the fept based alloy as a function of the Nd content had maximum values, respectively.

关键词： fe-pt alloys phase transformation exchange coupling remanence ratio rare earths

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