Al-Cu合金の粘鋳法における撹拌条件と結晶粒微細化

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  • Stirring Conditions and Grain Refinement in Al-Cu Alloys by Rheocasting
  • Al Cu ゴウキン ノ ネンチュウホウ ニ オケル カクハン ジョウケン ト

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An investigation is reported on stirring conditions and grain refinement of Al-Cu alloys including 10, 24 and 30 mass% copper with high ductility at an elevated temperature in the vacuum rheocasting in which the alloy is violently agitated at very high rotation speeds of a stirrer inserted in the solid-liquid coexisting zone. The results are as follows. The average size of primary solid particles in these alloys is consistently decreased with the increase in rotation speed from 20 to 67 rev/s at a cooling rate of about 0.42 K/s. The primary solid particle sizes at 67 rev/s are 90±29 μm in Al-10%Cu, 61±32 μm in Al-24%Cu and 46±14 μm in Al-30%Cu. The primary solid particle is more refined into 41±12 μm in diameter at a stirrer speed of 67 s−1 by addition of grain refiners of 0.5%Ti and 0.1%B to Al-24%Cu. It also becomes smaller in the rheocasting of Al-10%Cu and Al-24%Cu alloys in a mold with ribs machined along the face of cylindrical wall. The values of elongation at 773 K are 91% in Al-24%Cu and 71% in Al-30%Cu at an initial strain rate of 1.19×10−3 s−1.

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  • 日本金属学会誌

    日本金属学会誌 49 (8), 663-669, 1985

    公益社団法人 日本金属学会

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