日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 5 (1988),
pp. 502-507

Effect of Zirconium on Stabilization for the 1-7 Phase in 2-17 Type Sm-Co Permanent Magnet

Takayuki Nishio1, Yasuji Fukui2 and Yoshiro Iwama1

1Department of Crystalline Materials Science, Nagoya University, Nagoya
2Aichi Steel Works Ltd., Tokai

Abstract:

The 2-17 type rare earth permanent magnets show high coercivity only when they are subjected to aging after solution treatment. It is necessary for obtaining the high coercivity that they are in a single 1-7 phase region at the solution temperature. In the present study, an isothermal phase diagram in the Sm-Zr-Co ternary system at 1473 K close to the solution temperature was constructed, in order to investigate the extent of composition ranges stable for the 1-7 phase due to Zr addition, and the behavior of the Zr atom in the 1-7 phase was investigated. It is shown that the Zr addition may fairly extend the stable 1-7 phase region to the higher Co content. Zr atom dissolved in the 1-7 phase seems to substitute either a pair of Co atoms occupying a dumbbell site or a single Sm atom involved in the 1-7 phase.


(Received 1987/10/13)

Keywords:

rare earth permanent magnet, phase diagram, 1-7 phase, samarium-cobalt-zirconium system


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