Journal article

Publication year: 2021

Journal: Materials

Volume number: 14

Issue number: 11

eISSN: 1996-1944

Open access status: Gold

DOI Link: https://doi.org/10.3390/ma14112920

Publisher: MDPI

Abstract: 
Understanding the rapid solidification behavior characteristics, nucleation undercooling, and nucleation mechanism is important for modifying the microstructures and properties of metal alloys. In order to investigate the rapid solidification behavior in-situ, accurate measurements of nucleation undercooling and cooling rate are required in most rapid solidification processes, e.g., in additive manufacturing (AM). In this study, differential fast scanning calorimetry (DFSC) was applied to investigate the nucleation kinetics in a single micro-sized Al-20Si (mass%) particle under a controlled cooling rate of 5000 K/s. The nucleation rates of primary Si and secondary alpha-Al phases were calculated by a statistical analysis of 300 identical melting/solidification experiments. Applying a model based on the classical nucleation theory (CNT) together with available thermodynamic data, two different heterogeneous nucleation mechanisms of primary Si and secondary alpha-Al were proposed, i.e., surface heterogeneous nucleation for primary Si and interface heterogenous nucleation for secondary alpha-Al. The present study introduces a practical method for a detailed investigation of rapid solidification behavior of metal particles to distinguish surface and interface nucleation.

Harvard Citation style: Peng, Q., Yang, B., Milkereit, B., Liu, D., Springer, A., Rettenmayr, M., et al. (2021) Nucleation Behavior of a Single Al-20Si Particle Rapidly Solidified in a Fast Scanning Calorimeter, Materials, 14(11), Article 2920. https://doi.org/10.3390/ma14112920

APA Citation style: Peng, Q., Yang, B., Milkereit, B., Liu, D., Springer, A., Rettenmayr, M., Schick, C., & Kessler, O. (2021). Nucleation Behavior of a Single Al-20Si Particle Rapidly Solidified in a Fast Scanning Calorimeter. Materials. 14(11), Article 2920. https://doi.org/10.3390/ma14112920