On the Magnetic-Field-Cooling Treatment at Low Temperature of Alnico-V Type Alloy

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  • Alnico V型磁石合金の低温磁冷処理について
  • Alnico Vガタ ジシャク ゴウキン ノ テイオンジレイショリ ニ ツイテ

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Abstract

The authors studied the behavior of abnormal structure of Alnico-V Type magnetic alloy and its magnetic-field-cooling treatment at low temperatures which was conducted at about 875°C. In the presence of γ phase at mono-phase temperatures, there appeared abnormal structures at room temperature due to the transformation of γ to α. Existence of abnormal structures deteriorated the magnetic properties. The abnormal structure, once produced, could not be erased at lower temperatures and persisted after magnetic-field-cooling treatment. In the case of large specimens, abnormal structures often appear resulting from the inevitable slow cooling after casting. In these cases, if the specimens are once heated to upper mono-phase temperatures and cooled in air or water, they become free of abnormal structures and the subsequent magnetic-field-cooling treatment at low temperatures becomes effective. When specimens are kept for a long time in the lower mono-phase temperature range, γ phase is apt to appear even at temperatures as low as 850° and keeping specimens too long at these temperatures should be avoided.

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