Twinning engineering of high-entropy alloys: An exercise in process optimization and modeling - Archive ouverte HAL Access content directly
Journal Articles Materials Science and Engineering: A Year : 2021

Twinning engineering of high-entropy alloys: An exercise in process optimization and modeling

(1) , (2, 3) , (1) , (4, 5)
1
2
3
4
5

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.
Not file

Dates and versions

hal-03420392 , version 1 (09-11-2021)

Identifiers

Cite

Jongun Moon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin. Twinning engineering of high-entropy alloys: An exercise in process optimization and modeling. Materials Science and Engineering: A, 2021, 822, pp.141681. ⟨10.1016/j.msea.2021.141681⟩. ⟨hal-03420392⟩
19 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More