Journal
ACTA MATERIALIA
Volume 196, Issue -, Pages 609-625Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.07.006
Keywords
Additive manufacturing; Structural evolution; Electron microscopy; High-entropy alloy
Funding
- Microscopy Australia node at the University of Sydney (Sydney Microscopy Microanalysis)
- Australia-US Multidisciplinary University Research Initiative program
- Australian Research Council [DP190102243, DE180100440]
- US Department of the Navy, Office of Naval Research under ONR award [N00014-18-1-2794]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office [DE-AC05-00OR22725]
- U.S. Department of Energy [DE-AC05-00OR22725]
- Department of Energy
- Australian Research Council [DE180100440] Funding Source: Australian Research Council
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Metallic materials produced by additive manufacturing experience complex stress and thermal gyrations along the build direction. This has the potential to produce complicated heterogeneous microstructures that may exhibit a wide variety of mechanical properties. There remains a paucity of studies on the nature and the formation mechanisms of the microstructural heterogeneity and this limits our capability for microstructural design in additively manufactured metallic materials. Here, we present an electron microscopy-based investigation of a CrMnFeCoNi high-entropy alloy produced by selective laser melting. We have focussed on a systematic investigation of the microstructural evolution along the build direction. Our results reveal a remarkable hierarchy of microstructures, including the formation of nanocrystalline grains, elemental segregation and precipitation, cellular dislocation structures, deformation twinning, and deformation-induced phase transformation. Our research clarifies the relationships amongst different features, and provides guidance for future structural manipulation of materials produced by additive manufacturing. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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