Solidification Structure of Functionally Graded Hypereutectic Al-Ni Alloys Produced by Centrifugal Duplex Casting

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  • Ohmi Tatsuya
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Ueda Makoto
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Itoh Youichi
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Matsuura Kiyotaka
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Kudoh Masayuki
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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Other Title
  • 複合鋳込み遠心鋳造法により作製した過共晶Al-Ni合金傾斜機能材の凝固組織
  • フクゴウ イコミ エンシン チュウゾウホウ ニ ヨリ サクセイ シタ カキョウショウ Al Ni ゴウキン ケイシャ キノウザイ ノ ギョウコ ソシキ

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Solidification structures of Al-Ni and Al-Ni-Si alloys produced by Centrifugal Duplex Casting (CDC process) have been investigated. The CDC process is applicable to the production of a cast pipe of an aluminum alloy with an in situ composite layer containing fine intermetallic crystals. In this process, two molten metals, i.e. “the first melt” (aluminum or a hypoeutictic aluminum alloy) and “the second melt” (a hypereutectic or hyperperitectic aluminum-transition metal alloy with a higher liquidus temperature), are poured in sequence at a given interval into a roating mold of a centrifugal caster. Because the first melt acts as a coolant, the second melt is rapidly quenched to precipitate extremely fine primary crystals when they are mixed in the mold.<BR>When the first melt of an Al-5 mass%Ni alloy and the second melt of an Al-30 mass%Ni alloy were used, the composite layer in the CDC pipe consisted of the `“refined composite layer” with fine intermetallic particles and the “coarse composite layer” with relatively coarse particles. The coarse composite layer is subdivided into two sub-layers, i.e. the layer with accumulated flaky particles and that with freely grown particles.<BR>The refined composite layer was not formed when the first melt was aluminum whose melting point is higher than the liquidus temperature of the Al-5 mass%Ni alloy. On the other hand, large clusters with fine Al3Ni crystals were formed when the first melt was an Al-12 mass%Si alloy whose liquidus temperature is lower than the Al-Al3Ni eutectic temperature. However, these clusters did not form the refined composite layer but coexisted with flaky particles of Al3Ni.

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