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流變壓鑄工藝參數對半固態A356鋁合金充填性的影響

Effect of technological parameters on filling behavior of semi-solid A356 alloy by rheocasting

  • 摘要: 研究了半固態A356鋁合金漿料的成形溫度、壓射比壓和壓射沖頭速度對半固態A356鋁合金流變壓鑄充填性的影響.實驗結果表明:較高的半固態A356鋁合金漿料的成形溫度有利于獲得良好的充填性.壓射比壓和壓射沖頭速度對半固態A356鋁合金漿料充填性也具有較大的影響.在本實驗條件下,壓射沖頭速度越大或壓射比壓越大,充填性越好.試片的壁厚對半固態A356鋁合金漿料的充填性影響較大,試片壁厚越大,越容易充填.此外,采用低過熱度澆注和弱電磁攪拌技術制備的A356鋁合金漿料和流變壓鑄試片的組織分布很均勻,有利于獲得優質的半固態壓鑄件.

     

    Abstract: The effect of forming temperature, injection pressure and piston velocity on the filling ability of semi-solid A356 aluminum alloy slurry were investigated. It is shown that a higher forming temperature helps to the good filling ability, and injection pressure and piston velocity have important effect on the filling ability. The higher the injection pressure, or the higher the piston velocity, the better the filling ability is. Besides the thickness of a sample piece has great effect on the filling ability, and the thicker the sample piece, the better the filling ability. The results also show that the mierostructure distribution of A356 semisolid alloy is homogeneous, which is helpful to high quality castings.

     

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