Structures and Mechanical Properties of Semi-Solid Formed AC9B Aluminum Alloy.

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  • 半溶融成形加工したＡＣ９Ｂアルミニウム合金の組織および機械的性質
  • ハン ヨウユウ セイケイ カコウシタ AC9B アルミニウム ゴウキン ノ ソ

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Abstract

  Semi-solid press-forming process is applied for AC9B aluminum alloy in order to suppress the floating of primary Si by press-forming at semi-solid state and to improve the mechanical properties by refining eutectic Si. By heating 15% strain-introduced bulk specimen, a microstructure is able to be obtained in which nearly spherical aluminum solid solution and primary Si distribute uniformly. Furthermore, eutectic Si becomes finer than that of as cast specimen due to rapid cooling. Tensile strength of the press-formed specimen from room temperature to 473K are more or less equal to those of as cast specimen because cracks occur in primary Si. The strain-introduced bulk can be injected into cavity with thickness of 1mm at the semi-solid temperature, and the spherical aluminum solid particles, primary Si and eutectic phases distribute uniformly in the formed specimen.

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