Co-Al系新磁石合金「Malcolloy」について

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  • On A New Magnet Alloy “Malcolloy” in the System of Cobalt and Aluminum
  • Co-Alケイ シン ジシャク ゴウキン Malcolloy ニ ツイテ
  • On A New Magnet Alloy “Malcolloy” in the System of Cobalt and Aluminum

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Magnetic properties of ferromagnetic Co-Al alloys containing 4.32∼24.90% of Al have been measured. It has been found that the alloys containing more than about 10% of Al shows high coercive forces when tempered at 500°∼550°C after water-quenching from 1380°C (non-magnetic β′ phase): The 15.02%Al alloy showing the highest coercive force have a residual magnetic flux density of 4,200 G, a coercive of 1,200 Oe and a maximum energy product of 1.71×106 G·Oe. Thus the present investigators have named these alloys “Malcolloy” which is a abbreviation of Magnetic Al-Co alloy. These alloys having high coercive forces consist of many ferromagnetic elongated particles about 300∼1000Å in mean diameter dispersed in the matrix of non-magnetic β′ phase and consequently it may be concluded that the high coercivity of these alloys is probably caused by the existence of small these particles, each of them being composed of a single magnetic domain.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (11), 561-565, 1963

    公益社団法人 日本金属学会

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