Twinning engineering of high-entropy alloys: An exercise in process optimization and modeling
SCIE
SCOPUS
- Title
- Twinning engineering of high-entropy alloys: An exercise in process optimization and modeling
- Authors
- Moon, Jongun; Bouaziz, Olivier; Kim, Hyoung Seop; Estrin, Yuri
- Date Issued
- 2021-08
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- In a bid to improve the mechanical properties of high-entropy alloys, particularly, their strain hardening capability, we adapted the time-proven concept of 'twinning engineering', developed in the context of TWIP steels, to twinning-assisted high-entropy materials. The strategy chosen involved a two-step thermomechanical processing that consisted of low-temperature pre-straining and subsequent annealing. This approach was trialled on CoCrFeMnNi as an exemplary high-entropy alloy. The annealing conditions selected ensured that the deformation twins generated under low-temperature deformation were retained, whilst the dislocation density was recovered. The viability of this strategy was convincingly confirmed for room temperature deformation of the alloy. A constitutive model accounting for the effect of the pre-straining induced deformation twins was proposed. It was shown to provide a reliable description of the low-temperature and room-temperature deformation behavior of CoCrFeMnNi when deformation twins are involved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/109057
- DOI
- 10.1016/j.msea.2021.141681
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 822, 2021-08
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