急冷凝固したＡｌ‐Ｚｒ合金の組織と相分解

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タイトル別名
  • Structure and phase decomposition of supersaturated Al-Zr solid solutions rapidly solidified
  • キュウレイ ギョウコシタ Al Zr ゴウキン ノ ソシキ ト ソウ ブンカイ

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抄録

Solidified structure, mechanical properties and phase decomposition were investigated on the Al-(0.23.4)%Zr alloys chill-cast or splat quenched to extend the solid solubility of Zr in Al. Slowly cooled alloys containing 1.13.4%Zr have a equilibrium Al3Zr phase in the shape of a large needle. Chill-cast alloys containing 0.2 to 1.4%Zr have f.c.c. solid solutions highly supersaturated. Chill-cast alloys containing Zr more than 1.7% have a non-equilibrium Ll2 structure. The metastable Al3Zr plays active nuclei for the angular structure and leads to grain refining. Presence of the anglar structure containing more of Zr results in abrupt increase of strength of the alloys. Decomposition of the supersaturated solid solution during tempering occurs by forming a spherical intermediate cubic Al3Zr phase. The spherical precipitate is very slowly coarsened and then preferentially grows along the definite matrix direction. The grain boundary reaction is also observed in the early stage of againg. These precipitates are metastable Al3Zr of Ll2 type structure which is stable during prolonged aging time.

収録刊行物

  • 軽金属

    軽金属 27 (3), 129-137, 1977

    一般社団法人 軽金属学会

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