Al - Mg合金
Al - Mgアルミニウム合金の性能特性は次のとおりです。室温での良好な機械的特性。 強力な耐食性; 不十分な鋳造特性、機械的特性の大きな変動、および肉厚効果。 長期間の使用、経年劣化による合金の可塑性、さらにはダイカストでの亀裂の発生。 ダイカストの応力腐食割れの傾向も大きくなります。 Al - Mg合金の欠点は、その利点を部分的に相殺し、用途が制限されます。
Al - Zn合金
Al - Znアルミニウム合金ダイカストは、自然時効後に高い機械的特性を得ることができます。 亜鉛の質量分率が10％を超えると、強度が大幅に向上します。 この合金の欠点は、耐食性が低く、応力腐食が発生しやすく、ダイカスト中に高温割れが発生しやすいことです。 一般的に使用されているY401合金は流動性が高く、キャビティを簡単に充填できます。 不利な点は、細孔を形成する傾向が大きく、シリコンと鉄の含有量が少ないと、ホットクラックが発生しやすいことです。
Al - Si合金
Because Al-Si aluminum alloy has the characteristics of small crystallization temperature interval, large solidification latent heat of silicon phase in the alloy, large specific heat capacity, and relatively small linear shrinkage coefficient, its casting performance is generally better than other aluminum alloys. Its filling ability is also good, and the tendency of thermal cracking and shrinkage is relatively small. The Al-Si eutectic contains the least amount of brittle phase (silicon phase), and its mass fraction is only about 10 percent , so its plasticity is better than that of other aluminum alloy eutectic, and the remaining brittle phase can be further treated by modification. Improve plasticity. The test also shows that the Al-Si eutectic still maintains good plasticity at the temperature near its freezing point, which is not found in other aluminum alloys. There is often a considerable amount of eutectic in the cast alloy structure to ensure its good casting performance; the increase in the number of eutectic will make the alloy brittle and reduce the mechanical properties, there is a certain contradiction between the two. However, due to the good plasticity of Al-Si eutectic, it can better take into account the requirements of both mechanical properties and casting properties, so Al-Si alloy is currently the most widely used die-casting aluminum alloy.
