This study investigates the solidification process of individual micro-sized AlSi10Mg particles using continuous cooling and isothermal differential fast scanning calorimetry (DFSC) methods at a range of cooling rates (from 500 K/s to 50,000 K/s) and temperatures (from 562 °C to 502 °C). The solidification microstructure consists of fine α-Al dendrites and (α-Al + Si) eutectics. Both dendrite arm spacing and eutectic spacing decrease with increasing cooling rate, as well as decreasing solidification temperature. The continuous cooling treatment exhibits finer microstructures compared to those observed in the isothermal treatment in the similar solidification temperature range. Overall, this study highlights the effectiveness of the DFSC methods, along with microstructure characterization, in analyzing the solidification process of individual powder particles over a wide range of cooling rates and temperatures.

本研究使用连续冷却和等温差示快速扫描量热法 (DFSC) 方法，在一系列冷却速率（从 500 K/s 到 50,000 K/s）和温度（从 562 ° C 至 502°C）。凝固组织由细小的α -Al枝晶和( α -Al+Si)共晶组成。枝晶臂间距和共晶间距都随着冷却速率的增加以及凝固温度的降低而减小。在相似的凝固温度范围内，与等温处理中观察到的微观结构相比，连续冷却处理表现出更精细的微观结构。总体而言，这项研究强调了 DFSC 方法以及微观结构表征在分析单个粉末颗粒在各种冷却速率和温度下的凝固过程中的有效性。