This work investigates the optimum pouring temperature during semisolid casting (rheo-casting) of Al–17%Si alloy (A390) to obtain the best combination of microstructure modification and wear resistance. Pouring semisolid slurry was done in both metallic and sand molds to observe the effect of cooling rate on the optimum pouring temperature. The molten metal/slurry was poured into the specified mold type through a cooling slope plate which was continuously water cooled. Different pouring temperatures: 670, 690, 710 and 730 °C, were applied, and their influence on the microstructure and alloy properties was analyzed. Based on the obtained results, the optimum pouring temperature for semisolid casting was decided for the two mold types. Conventional casting was conducted at the optimum temperature in both metallic and sand molds for comparison. It was observed that rheo-casting using the cooling plate is an effective process in microstructure modification of A390 alloy in terms of refining and redistributing the primary Si and fragmenting the coarse AlFeMnSi phase. The optimum temperatures to obtain small particle size of primary Si, uniform distribution and regular shape using the cooling plate technique were 690 °C and 710 °C for the metallic and sand molds, respectively. This refinement and homogenization of the microstructure enhanced the hardness and wear resistance of alloy A390.

这项工作研究了Al-17％Si合金（A390）的半固态铸造（流变铸造）过程中的最佳浇铸温度，以获得微观组织改性和耐磨性的最佳组合。在金属和砂型模具中浇注半固态浆料，以观察冷却速度对最佳浇注温度的影响。通过连续水冷的冷却斜板将熔融金属/浆料倒入指定的模具类型。应用了不同的浇注温度：670、690、710和730°C，并分析了它们对显微组织和合金性能的影响。根据获得的结果，确定两种模具的半固态铸造最佳浇铸温度。为了进行比较，常规铸造是在金属和砂型模具中的最佳温度下进行的。观察到，就精炼和重新分布初生Si以及破碎粗大的AlFeMnSi相而言，使用冷却板的流变铸造是A390合金显微组织改性的有效方法。对于金属模具和砂型模具，使用冷却板技术获得较小的原始Si粒度，均匀分布和规则形状的最佳温度分别为690°C和710°C。微观结构的这种细化和均质化提高了合金A390的硬度和耐磨性。对于金属模具和砂型模具，使用冷却板技术的均匀分布和规则形状分别为690°C和710°C。微观结构的这种细化和均质化提高了合金A390的硬度和耐磨性。对于金属模具和砂型模具，使用冷却板技术的均匀分布和规则形状分别为690°C和710°C。微观结构的这种细化和均质化提高了合金A390的硬度和耐磨性。