Microstructure and phase equilibria of Al2FeCoNiCu high-entropy alloy were investigated by a combination of experiments and multiscale computational materials. The CALPHAD and experimental results showed that a BCC dendritic phase formed during solidification, while a Cu-rich inter-dendritic phase with FCC structure precipitated at lower temperature. These FCC inter-dendritic phases were also surrounded by acicular precipitates with the same structure and composition. These acicular precipitates were stable during homogenization of the alloy at 550 °C, but they started to dissolve when heat-treated at 900 °C. Molecular simulation results revealed a disparate mechanism between nucleation of the FCC phase and its growth. While low annealing temperature (large undercooling of BCC) aided the nucleation process, diffusion-driven growth of the FCC crystals was faster at higher annealing temperatures.
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We would like to thank Dr. Trevor Harding, Dr. Ryan Smith, Mr. Eric Beaton, Mrs. Caitlin Kriewall, and the NACE club of the Materials Engineering Department for their assistance and/or inputs in this project. We are also thankful to ASM Materials Genome Toolkits award (2020).
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Kivy, M.B., Mahata, A.K., Thompson, R. et al. Experimental and Computational Study of Microstructure of Al2FeCoNiCu High-Entropy Alloy. J. Phase Equilib. Diffus. 44, 76–85 (2023). https://doi.org/10.1007/s11669-023-01024-4