2相Ni-Co合金および純Co結晶の磁区模様

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タイトル別名
  • Ferromagnetic Domain Patterns on Two-Phase Nickel-Cobalt Alloy and Pure Cobalt Crystals (Ferromagnetic Domain Patterns on Ni-Co Alloy and Pure Cobalt Crystals, II)
  • 2ソウ Ni-Co ゴウキン オヨビ ジュンCo ケッショウ ノ ジク モヨウ

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抄録

Ferromagnetic domain patterns were observed, using the powder pattern technique, with single crystals of Ni-Co alloys containing 69 and 70%Co as well as with cobalt ingots as solidified slowly and then variously heat-treated. In 69%Co-Ni single crystals, ε (hexagonal close-packed) phase crystals were seen as layers parallel to {111} planes, indicating that the boundary of the γ (fece-centered cubic) phase is located at 68%Co. On the {110} surface of 69%Co-Ni single crystals, traces of ε phase crystals were seen as bands parallel to two ⟨112⟩ and one ⟨110⟩ directions. The behavior of 180°C domain walls in the matrix γ phase crystals when they cross the ε-phase crystal bands show that the direction of easy magnetization in ε phase nickel-cobalt alloys is [0001] direction, irrespective of the composition, just as in cobalt. Cobalt specimens, which were solildfied slowly from the melt and then cooled very sowly through the γ→ε transformation temperature, are seen to be divided finely by numerous ε-phase crystal bands, among which there exist γ-phase cryistal regions of parallelogram and triangular shapes. A similar structure is observed in cobalt as quenched in hot water after slow solidification, although the proportion of γ-phase in quenched specimens is larger than in slowly cooled specimens.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (3), 229-233, 1961

    公益社団法人 日本金属学会

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