Enhanced deformation-induced FCC-HCP transformation of a metastable high-entropy alloy induced by a smaller grain size
- Authors
- Ock, Il-Seob; Kim, Jin-Seob; Kim, Jin-Kyung
- Issue Date
- Jun-2024
- Publisher
- Elsevier BV
- Keywords
- High-entropy alloy; Deformation-induced HCP phase; TRIP; Grain boundary stress; Deformation mechanism
- Citation
- Materials Science and Engineering: A, v.902, pp 1 - 10
- Pages
- 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Engineering: A
- Volume
- 902
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/119527
- DOI
- 10.1016/j.msea.2024.146610
- ISSN
- 0921-5093
1873-4936
- Abstract
- This study reports the grain-size-dependent deformation-induced face-centered cubic (FCC)-hexagonal closepacked (HCP) transformation behavior of Fe49.5Mn30Co10Cr10C0.2Ti0.1V0.1Mo0.1 (at. %) high-entropy alloy in the medium grain size range (10-20 mu m), their mechanical properties, and deformation mechanisms. The materials annealed at 900 degrees C for 1 h (A900-1) and 10 h (A900-10) showed a fully FCC, recrystallized microstructure with a larger grain size in the latter owing to grain growth during annealing. The A900-1 sample exhibited a larger strength-ductility balance and a higher strain hardening rate than the A900-10 sample. The A900-1 sample, with a larger number of grain boundary nucleation sites of the deformation-induced HCP phase, exhibited a higher HCP transformation rate than the A900-10 sample in the early stage of deformation below 10 % strain, whereas both materials showed similar HCP transformation rates at strain levels higher than 30 %. The emission of deformation-induced HCP plates in both neighboring grains from the same grain boundary (A900-1) and the activation of the deformation-induced HCP phase in a single grain and only dislocations in the neighboring grains (A900-10) suggest the importance of grain boundary stress in the observed phenomena. The observed additional mechanisms other than dislocation slip and deformation-induced HCP phase, that is, reverse FCC-HCP transformation, HCP {1012} twinning, and kink banding, could contribute to deformation accommodation and stress relaxation, thereby leading to the excellent ductility of the investigated materials.
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