Journal Article

PUBDB-2026-02288

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hardening by annealing in the medium-entropy alloy CrCoNi after equal-channel angular pressing

Rymer, L.-M. (Corresponding author) ; Höppel, H. W.Extern* ; Ortner, P. ; Pfeffer, N.Extern* ; Stark, A.Extern*Hereon* ; Winter, L. ; Lampke, T.

2026
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.mtcomm.2026.114751  doi:10.3204/PUBDB-2026-02288

Abstract: After equal-channel angular pressing (ECAP) and a subsequent heat treatment at 600 ◦C for 1 h, the MEA CrCoNiis characterized by a yield strength of about 1.4 GPa but a drastically low uniform elongation of 1.2 %. HighenergyX-ray diffraction analysis, transmission electron microscopy, and high-resolution high-angle annulardark-field scanning transmission electron microscopy investigations were performed, but the cause of theannealing-induced hardening could not be conclusively determined, although differential scanning calorimetrymeasurements reveal an exothermic peak and thus microstructural changes in the temperature range between450 ◦C and 650 ◦C. Despite the complex nature of the MEA CrCoNi, the dominant deformation mechanisms afterECAP processing and a subsequent heat treatment during straining appear to be similar to those of conventionalalloys. It is assumed that the rearrangement of dislocations in low-energy configurations and, to some extent,grain and twin boundary relaxation lead to the anneal-induced hardening effect at 600 ◦C. Grain boundarydislocations are hindered from bowing out or activating new dislocation sources, resulting in the strong increasein yield and ultimate tensile strength.

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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-20230881 (I-20230881) (I-20230881)
3. DFG project G:(GEPRIS)468469638 - Einfluss von Zwillingseffekten und Korngrößenverteilung auf das Rissausbreitungsverhalten der Medium-Entropie-Legierung CrCoNi durch hochgradig plastische Verformung und Wärmebehandlung (468469638) (468469638)

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 - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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