Kessler Olaf, Zhuravlev Evgeny, Wenner Sigurd, Heiland Steffen, Schaper Mirko
Chair of Materials Science, Rostock University, 18051 Rostock, Germany.
Competence Centre °CALOR, Department Life, Light and Matter, Rostock University, 18051 Rostock, Germany.
Materials (Basel). 2022 Oct 15;15(20):7195. doi: 10.3390/ma15207195.
High-strength aluminium alloy powders modified with different nanoparticles by ball milling (7075/TiC, 2024/CaB6, 6061/YSZ) have been investigated in-situ during rapid solidification by differential fast scanning calorimetry (DFSC). Solidification undercooling has been evaluated and was found to decrease with an increasing number of nanoparticles, as the particles act as nuclei for solidification. Lower solidification undercooling of individual powder particles correlates with less hot cracking and smaller grains in the material produced by powder bed fusion of metals by a laser beam (PBF-LB/M). Quantitatively, solidification undercooling less than about 10-15 K correlates with almost crack-free PBF-LB/M components and grain sizes less than about 3 µm. This correlation shall be used for future purposeful powder material design on small quantities before performing extensive PBF-LB/M studies.
通过球磨用不同纳米颗粒改性的高强度铝合金粉末（7075/TiC、2024/CaB6、6061/YSZ）在快速凝固过程中通过差示快速扫描量热法（DFSC）进行了原位研究。已经评估了凝固过冷度，发现其随着纳米颗粒数量的增加而降低，因为颗粒充当凝固的核心。单个粉末颗粒较低的凝固过冷度与通过激光束进行金属粉末床熔融（PBF-LB/M）生产的材料中较少的热裂纹和较小的晶粒相关。定量地说，凝固过冷度小于约10-15 K与几乎无裂纹的PBF-LB/M部件以及小于约3 µm的晶粒尺寸相关。这种相关性将用于未来在进行广泛的PBF-LB/M研究之前对少量粉末材料进行有目的的设计。
