Flowout Behavior of Al-Si Alloys during Solidification under Pressure

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  • 加圧下でのAl-Si系合金固液共存溶湯の流出挙動
  • カアツ カ デ ノ Al Siケイ ゴウキンコエキ キョウゾン ヨウトウ ノ リュウシュツ キョドウ

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Abstract

  In squeeze castings, molten metal is forcibly fed for shrinkage. In this study, in order to find the most suitable squeeze timing, the outflow ability of the molten metal during solidification under pressure was investigated.<br>  The outflow ability of aluminum alloys was found to depend on the solid fractions and the species of the solid phase. For example, the outflow volume from pressurized molten metal was found to decrease with the increase of the solid fractions, after which the outflow volume becomes constant and small. At this inflection point, the solid fractions of Al-4% Si alloy with many primary dendrite crystals were smaller than that of the Al-8% Si alloy. This outflow ability of alloys which solidifiy into mushy state can be improved by grain refinement, because the outflow ability depends on the state of the solid phase in the molten metal.

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