期刊
ACTA MATERIALIA
卷 212, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116880
关键词
High-entropy alloys; Undercooling; Metastable solidification; Growth kinetics; Microstructure
资金
- Brazilian Federal Agency for Support and Evaluation of Graduate Education CAPES [88887.161381/201700]
- DLR Space Administration
- Federal Ministry for Economic Affairs and Energy (BMWi) [50WM1546]
- Leibniz IFW Dresden
The solidification behavior of the CoCrFeNi high-entropy alloy, ternary CrFeNi, and CoCrNi medium-entropy suballoys was studied using high-speed video and synchrotron X-ray diffraction techniques. The results showed that the crystal-growth velocities of these alloys were comparable to Fe-Ni and Fe-Cr-Ni alloys, indicating similar crystallization kinetics. The effect of melt undercooling on the microstructure of solidified samples was also analyzed and discussed.
The solidification behavior of the CoCrFeNi high-entropy alloy and the ternary CrFeNi and CoCrNi medium-entropy suballoys has been studied in situ using high-speed video and synchrotron X-ray diffraction on electromagnetically levitated samples. In all alloys, the formation of a primary metastable bcc phase was observed if the melt was sufficiently undercooled. The delay time for the onset of the nucleation of the stable fcc phase, occurring within bcc crystals, is inversely proportional to the melt undercooling. The experimental findings are corroborated by thermodynamic calculations of stable and metastable phase diagrams for the (CoCrNi)-Fe section. Crystal-growth velocities for the CrFeNi, CoCrNi, and CoCrFeNi medium-and high-entropy alloys extracted from the high-speed video sequences in the present study are comparable to the literature data for Fe-rich Fe-Ni and Fe-Cr-Ni alloys, evidencing the same crystallization kinetics. The effect of melt undercooling on the microstructure of solidified samples is analyzed and discussed. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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