Enhanced strength-ductility balance of the (CoCrFeNiMn)95.2Al3.2Ti1.6 high-entropy alloy by co-precipitation of the B2 and sigma phases
- Authors
- Yang, Guanghui; Kang, Jiyeon; Kim, Jin-Kyung; Park, Joo Hyun
- Issue Date
- May-2023
- Publisher
- Elsevier BV
- Keywords
- B2 phase; Co-precipitation; High entropy alloy; Mechanical properties; Sigma phase
- Citation
- Materials Science and Engineering: A, v.873, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Engineering: A
- Volume
- 873
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187310
- DOI
- 10.1016/j.msea.2023.145039
- ISSN
- 0921-5093
- Abstract
- The present work investigated the effect of the co-precipitation of the B2 and σ phases on the mechanical properties of the (CoCrFeNiMn)95.2Al3.2Ti1.6 high entropy alloy subjected to two-step annealing. The single-step annealed sample at 900 °C only showed B2 precipitates. Further annealing at 650 and 750 °C led to the co-precipitation of σ and B2 particles. The sizes and fractions of σ and B2 particles increased with increasing annealing temperature. The sample subjected to the second annealing at 750 °C, with large sizes and fractions of co-precipitated σ and B2 particles, exhibited high strength with maintaining moderate ductility (YS: 561 MPa, UTS: 1005 MPa, TE: 26%). The superior mechanical properties of the sample subjected to the second annealing at 750 °C could be owing to the co-precipitation hardening, back stress strengthening, joint activation of dislocation plasticity and deformation twinning. The present work offers a novel microstructure design to optimize the strength–ductility balance of high-entropy alloys via the co-precipitation of σ and B2 particles. © 2023 Elsevier B.V.
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