One of the greatest environmental goals for the aluminum alloys industry is generating higher quality products by introducing cleaner input materials while maintaining low production costs. A typical dilemma for the master alloy producers is the cleanness level of the master alloy since insoluble inclusions could serve as inoculants during the solidification process. In this work, commercial Ti5B1 master alloy is used for grain refinement of Al7Si4Cu aluminum alloy and compared with the cleaned master alloy that contained a lower amount of residual refractory oxides and salts. Metallography analysis was used for grain size measurement while Computer Aided Cooling Curve Analysis was used for assessment of the undercooling and heat release values. In all instances, specimens treated with the cleaned master alloy showed smaller grains in the final structure and lower undercooling values. The difference in released heat between liquidus and recalescence temperatures was about 25% in specimens where added 0.66 wt% of cleaned master alloys compared to specimens where the commercial master alloys were added. Using cleaner Ti5B1 master alloy with a higher number of TiAl₃ and TiB₂ particles improves its grain refinement efficiency and transmits fewer impurities in produced parts. Producing cleaner master alloy would be beneficial from economic and environmental aspects by increasing its value and service time of produced parts besides simplifying the recycling process at the end of parts life-cycle.

铝合金行业最大的环境目标之一是通过引入更清洁的输入材料来生产更高质量的产品，同时保持低生产成本。中间合金生产商面临的一个典型难题是中间合金的清洁度水平，因为不溶性夹杂物可能在凝固过程中充当孕育剂。在这项工作中，商业 Ti5B1 中间合金用于 Al7Si4Cu 铝合金的晶粒细化，并与含有较少残留难熔氧化物和盐的清洁中间合金进行比较。金相分析用于粒度测量，而计算机辅助冷却曲线分析用于评估过冷度和放热值。在所有情况下，用清洁的母合金处理的试样在最终结构中显示出较小的晶粒和较低的过冷度值。与添加商业母合金的试样相比，在添加 0.66 wt% 清洁母合金的试样中，液相线和再辉温度之间释放的热量差异约为 25%。使用更清洁的 Ti5B1 中间合金和更高数量的 TiAl₃和 TiB ₂颗粒提高了其晶粒细化效率并减少了生产零件中杂质的传输。除了在零件生命周期结束时简化回收过程之外，生产更清洁的母合金将有利于经济和环境方面的发展，增加其价值和生产零件的服务时间。