Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting

Z. G. Zhu; Q. B. Nguyen; F. L. Ng; X. H. An; X. Z. Liao; P. K. Liaw; S. M.L. Nai; J. Wei

doi:10.1016/j.scriptamat.2018.05.015

Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting

Z. G. Zhu, Q. B. Nguyen, F. L. Ng, X. H. An, X. Z. Liao, P. K. Liaw, S. M.L. Nai, J. Wei

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	20-24
Number of pages	5
Journal	Scripta Materialia
Volume	154
Issue number	September
DOIs	https://doi.org/10.1016/j.scriptamat.2018.05.015
Publication status	Published - 1 Sep 2018
Externally published	Yes

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10.1016/j.scriptamat.2018.05.015

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title = "Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting",

abstract = "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.",

keywords = "Cellular structure, High entropy alloys, Mechanical property, Selective laser melting, Steady strain hardening",

author = "Zhu, {Z. G.} and Nguyen, {Q. B.} and Ng, {F. L.} and An, {X. H.} and Liao, {X. Z.} and Liaw, {P. K.} and Nai, {S. M.L.} and J. Wei",

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doi = "10.1016/j.scriptamat.2018.05.015",

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TY - JOUR

T1 - Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting

AU - Zhu, Z. G.

AU - Nguyen, Q. B.

AU - Ng, F. L.

AU - An, X. H.

AU - Liao, X. Z.

AU - Liaw, P. K.

AU - Nai, S. M.L.

AU - Wei, J.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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.

AB - 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.

KW - Cellular structure

KW - High entropy alloys

KW - Mechanical property

KW - Selective laser melting

KW - Steady strain hardening

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DO - 10.1016/j.scriptamat.2018.05.015

M3 - Article

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VL - 154

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EP - 24

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

IS - September

ER -

Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting

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