マグネシウム特集号　Ｍｇ‐Ｙ合金の時効析出組織

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タイトル別名
  • Special issue "Magnesium and magnesium alloys". Precipitation structures of Mg-Y alloys.
  • Mg Y ゴウキン ノ ジコウ セキシュツ ソシキ

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抄録

Precipitation process and microstructures of both Mg-5%Y and Mg-10%Y (in mass%) alloys were investigated using hardness measurement, optical microscopy and transmission electron microscopy. In a Mg-5%Y alloy hardness increased slightly by about HV 10 with aging time at temperatures between 423 and 523K. In a Mg-10%Y alloy hardness increased markedly after certain incubation periods from 4340 to 38.7ks at aging temperatures between 423 and 498K. The TTT diagram for the precipitation of the β" phase was determined from the hardness curves of a Mg-10%Y alloy, the nose temperature being 498K. The hardness increase in a Mg-10%Y alloy at 423 to 498K was found to be caused by the homogeneous precipitation of the fine coherent metastable β" phase. The metastable β' and stable β phases precipitated and coarsened in a Mg-10%Y alloy at 523 to 573K. Both the β" and β' phases were found to have a base centered orthorhombic (bco) structure. The atom configurations in their unit cells, however, were assumed to be different from each other in the β" and β' phases because of the existence of weak reflection spots at the forbidden positions.

収録刊行物

  • 軽金属

    軽金属 42 (12), 804-809, 1992

    一般社団法人 軽金属学会

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