Assessing heat released only related to the formation of primary crystals provides results with a significantly higher sensitivity than a traditional assessment of undercooling value. In this work, two similar Ti5B1 master alloys (commercial and refined) are used for grain refinement of Al7Si4Cu aluminum alloy to assess narrow differences in heat release during primary crystallization. The heat released related to primary crystallization is 2.50 ± 0.03, 3.16 ± 0.12, and 7.92 kJ kg⁻¹ for samples treated with the refined master alloys, commercial master alloys, and sample solidified without grain refinement, respectively. The acquired results showed that the suggested method is more efficient in comparison with traditional metallographic or undercooling methods for the assessment of grain refining efficiency with the potential to extend the suggested approach on a wide range of metallic structures where solidification occurs by eutectic-type primary crystallization characteristics.

与传统的过冷值评估相比，评估仅与初级晶体形成有关的放热可提供具有明显更高灵敏度的结果。在这项工作中，两种相似的Ti5B1中间合金（商业的和精炼的）用于Al7Si4Cu铝合金的晶粒细化，以评估一次结晶过程中放热的窄差异。与一次结晶有关的释放的热量为2.50±0.03、3.16±0.12和7.92 kJ kg ^-1分别用精炼母合金，市售母合金和未经晶粒细化固化的样品进行处理。获得的结果表明，与传统的金相或过冷方法相比，该建议方法在评估晶粒细化效率方面更为有效，并且有可能将建议的方法扩展到通过共晶型一次结晶而发生凝固的各种金属结构上特征。