Journal Article

PUBDB-2025-05243

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Coarsening behavior and strengthening mechanisms of L12–Ni$_3$(Al, Ti) precipitates in a (CoCrNi)$_{94}$Al$_3$Ti$_3$ medium-entropy alloy

Han, S.Extern* ; Ryu, C. W. (Corresponding author)Extern*

2025
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2025.185273

Abstract: L12 precipitate-hardened high-entropy alloys (HEAs) and medium-entropy alloys (MEAs) exhibit outstanding mechanical properties. A comprehensive understanding of L12 precipitate behavior is essential to optimize the mechanical performance of these alloys. In this study, the precipitation behavior and corresponding mechanical properties of a (CoCrNi)94Al3Ti3 MEA were systematically investigated under various aging treatments. Aging at 900°C significantly improved the strength–ductility balance compared to conventional L12-hardened MEAs. In particular, the specimen aged at 900°C for 1 h showed an ultimate tensile strength (UTS) of 1102 MPa, a yield strength (YS) of 632 MPa, and an elongation (EL) of 45.7 %. However, prolonged aging to 48 h resulted in a reduction in strength due to the coarsening of the L12 precipitates. Quantitative analysis of the precipitate strengthening contribution revealed that the variation in strength was governed by distinct precipitate strengthening mechanisms: dislocation shearing and dislocation bypassing mechanisms. These findings provide valuable insights for optimizing aging conditions in L12 precipitate-hardened HEAs and MEAs, facilitating the design of next-generation structural materials.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20240928 (I-20240928) (I-20240928)

Experiment(s):

1. PETRA Beamline P21.1 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; 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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