ABSTRACT This study compares the microstructures and hardness of an AlSi10.6CuMg alloy obtained by sand casting and high pressure die casting (HPDC). The results show that the morphology of HPDC dendrites was not uniformly distributed as in sand casting. HPDC refines the morphology of intermetallics and produces a modification of eutectic silicon. Chinese-script is the dominant iron intermetallic in sand casting, while primary polyhedral and secondary proeutectic particles are dominant in HPDC. The results of the X-ray diffraction show the presence of high residual stresses in the HPDC. Deep etching for HPDC samples reveals θ-Al2Cu phases in very thin compact dendrites. No evidence of twin plane re-entrant edge assistance was found in the growth of primary silicon. The primary silicon plate-like becomes unstable in HPDC, resulting in smooth and rounded outer surfaces. Hardness of HPDC alloy was about 11% higher than that of sand casting alloy.

中文翻译：

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砂型铸造与高压压铸AlSi10.6CuMg合金显微组织及硬度对比研究

摘要 本研究比较了通过砂型铸造和高压压铸 (HPDC) 获得的 AlSi10.6CuMg 合金的微观结构和硬度。结果表明，HPDC枝晶的形貌不像砂型铸造那样均匀分布。HPDC 改进了金属间化合物的形态并产生了共晶硅的改性。汉字是砂型铸造中占主导地位的铁金属间化合物，而一次多面体和二次共晶颗粒在 HPDC 中占主导地位。X 射线衍射结果表明 HPDC 中存在高残余​​应力。HPDC 样品的深度蚀刻显示了非常薄的致密枝晶中的 θ-Al2Cu 相。在初级硅的生长中没有发现双平面重入边缘辅助的证据。初级硅片状在 HPDC 中变得不稳定，导致光滑和圆形的外表面。HPDC合金的硬度比砂型铸造合金高约11%。