Journal
ACTA MATERIALIA
Volume 208, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116763
Keywords
High-entropy alloys; Sigma phase; Heat treatment; Phase diagram calculation; Ab initio calculations
Funding
- National Natural Science Foundation of China [51825401]
- Fund of the State Key Laboratory of Advanced Welding and Joining
- Swedish Research Council [202003736, 2017-06474, 2019-04971, 201805973]
- Swedish Steel Producers' Association
- Swedish Foundation for Strategic Research
- Swedish Energy Agency [2017-006800]
- Swedish Foundation for International Cooperation in Research and Higher Education [CH2020-8730]
- Hungarian Scientific Research Fund [OTKA 128229]
- China Scholarship Council
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Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. In this study, the phase decomposition and secondary phase formation in a high-entropy alloy were investigated under heat treatment conditions. The energetically preferred mechanism of phase decomposition into two solid solution phases was discussed based on ab initio calculations.
Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. Here, the phase decomposition under heat treatment in the Cr7Mn25Co9Ni23Cu36 (atomic percentage) high-entropy alloy and how secondary phases formed affect its tensile mechanical response are reported. The microstructural analysis shows that heat treatment at 800 degrees C /2 h and 600 degrees C /8 h led to the formation of sigma phase, but the sigma phase was not observed for 2 h heat treatment at 600 degrees C and below. The experimentally observed thermal stability and phases are compared to the calculated phase diagram and rationalized by recourse to thermodynamics and kinetics. The mechanism of phase decomposition is discussed based on ab initio calculations, indicating that decomposition into two solid solution phases is energetically preferred over a single solid solution phase with nominal composition. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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