Journal Article

PUBDB-2026-00057

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Strengthening and deformation mechanisms in CoCrFeMnNi-based medium- and high-entropy alloys at room and cryogenic temperatures

Silva, D. D. S. (Corresponding author)Extern* ; Coury, F. G. ; Vitos, L. ; Li, W. ; Huang, S.Extern* ; Schell, N.HZG*Hereon* ; Mason, P.Extern*XFEL.EU* ; Clarke, A. J.Extern*XFEL.EU* ; Kaufman, M. J.Extern* ; Bolfarini, C.Extern*

2026
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.actamat.2025.121879

Abstract: In this study, novel non-equiatomic CoCrFeMnNi-based medium- and high-entropy alloys (M/HEAs) weredesigned to activate distinct deformation mechanisms, including twinning-induced plasticity (TWIP) and/ortransformation-induced plasticity (TRIP). Tensile tests were performed at 298 and 173 K. A variety of ex-situmultiscale characterization techniques, strengthening modeling, thermodynamic modeling (CALPHAD method),and ab initio density functional theory (DFT) calculations were employed to investigate the structural andmicrostructural evolution, enabling accurate identification of the strengthening and active deformation mechanismsoperating in the M/HEAs. Strengthening modeling revealed that grain boundary strengthening was theprimary contributor to yield strength at both temperatures. A key finding of this study is that a controlledFCC→HCP martensitic transformation, associated with TRIP, enhances the strength-ductility balance even whenthe resulting HCP phase reaches ~50% volume fraction. This demonstrates that TRIP-enabled metastabilityengineering is a promising strategy for designing high-performance M/HEAs for next-generation structural applicationsin energy, aerospace, and defense.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20220798 (I-20220798) (I-20220798)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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