Journal
SCRIPTA MATERIALIA
Volume 154, Issue -, Pages 20-24Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.05.015
Keywords
Selective laser melting; High entropy alloys; Cellular structure; Mechanical property; Steady strain hardening
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Funding
- A*STAR Additive Manufacturing Centre (AMC) Initiative [1426800088]
- Australian Research Council [DE170100053, DP150101121]
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A near-fully dense CoCrFeNiMn high entropy alloy was additively manufactured by selective laser melting successfully. The as-built samples exhibit a hierarchical structure, including melt pools, columnar grains, sub-micron cellular structures, and dislocations. An outstanding combination of high strength and excellent ductility compared to those fabricated by conventional methods was achieved in the as-built samples. Quantitative analysis revealed that the cellular structures contribute significantly to the enhanced strength through dislocation hardening rather than cellular boundary strengthening. The excellent ductility is correlated with the steady strain hardening controlled by the sophisticated dislocation activities. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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