4.7 Article

Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy

Journal

SCRIPTA MATERIALIA
Volume 197, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113808

Keywords

High-entropy alloys; Twinning; Recovery; Strain hardening; Ductility

Funding

  1. Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3D1A1023384]

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Deformation-induced twinning was used as a strengthening mechanism in a thermomechanical treatment for a high-entropy alloy, resulting in improved mechanical properties, especially in strain hardening ability, at room temperature.
Deformation-induced twinning has been a notable example of overcoming the strength/ductility tradeoff dilemma as a strengthening mechanism. By borrowing this concept from the area of TWIP steels, we designed a thermomechanical treatment for a CoCrFeMnNi high-entropy alloy to improve its mechanical characteristics. We used pre-straining at 77 K to introduce deformation-induced twins in the microstructure of the alloy, and then recovered it by annealing at 773 K, while avoiding recrystallization. The deformation-induced twins generated by pre-straining at 77 K were retained after this heat treatment, whilst partial recovery of dislocations occurred. As a result, the room-temperature mechanical properties of the alloy, including its strain hardening ability, were improved substantially. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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