日本金属学会誌

J. Japan Inst. Metals, Vol. 27, No. 5 (1963),
pp. 216-221

On Heat Treatment and Magnetic Properties of MnAl Alloy

Noboru Makino1, Yasuo Kimura1 and Masaki Suzuki1

1Tokyo Keiki Seizosho Co.Ltd., Tokyo

Abstract:

MnAl alloy is most succesfully melted by high frequency induction furnace under argon atmosphere in alumina crucible. The alloy containing 68 to 70 wt% of Mn exhibits the highest saturation magnetization in this system. Ferromagnetic phase (π -phase) can be prepared by quenching and subsequent tempering. The adequate quenching temperature is 1100° to 1150°C. When quenched MnAl alloy is tempered at a temperature not exceeding 500°C, its saturation magnetization increases with time and approaches to a common limiting value. Higher the temperature is, more rapidly it reaches to the limit. For example, at 500°C, limiting value is realized within few tens of minuits. Although the specimen tempered at above 500°C losses its magnetic properties after a very rapid increasing in saturation magnetization, the peak value of it is rather higher than the limiting value in lower temperature tempering. X-ray diffraction and microstructure shows that the ferromagnetic phase thus obtained is entirely the same as what obtained through H. Kôno's ``controlled cooling''.


(Received 1963/2/21)

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