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Nano-graining a particle-strengthened high-entropy alloy

Authors
Lee, Dong-Hyun; Park, Jeong-Min; Yang, Guanghui; He, Junyang; Lu, Zhaoping; Suh, Jin-Yoo; Kawasaki, Megumi; Ramamurty, Upadrasta; Jang, Jae-il
Issue Date
2019-04-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SCRIPTA MATERIALIA, v.163, pp.24 - 28
Abstract
The possibility of further enhancing the strength of a (CoCrFeNi)(94)Ti2Al4 high-entropy alloy (HEA), which is already strengthened by Ni-3(Ti,Al) second-phase particles, by grain refinement through high-pressure torsion (HPT) is examined. Concomitant with nanograin formation, HPT was found to induce particle dissolution and structural transformation of the remnant particles. Nanoindentation experiments of nanocrystalline HEA, with and without particles in the pre-HPT microstructure, suggests that grain boundary strengthening is the dominant strengthening mechanism. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keywords
COARSE 2ND-PHASE PARTICLES; SEVERE PLASTIC-DEFORMATION; HALL-PETCH RELATIONSHIP; MECHANICAL-PROPERTIES; ACTIVATION VOLUME; RATE SENSITIVITY; PHASE-STABILITY; NANOCRYSTALLINE; BEHAVIOR; MICROSTRUCTURE; COARSE 2ND-PHASE PARTICLES; SEVERE PLASTIC-DEFORMATION; HALL-PETCH RELATIONSHIP; MECHANICAL-PROPERTIES; ACTIVATION VOLUME; RATE SENSITIVITY; PHASE-STABILITY; NANOCRYSTALLINE; BEHAVIOR; MICROSTRUCTURE; High-entropy alloy; Particle strengthening; Grain boundary strengthening; High-pressure torsion; Nanoindentation
ISSN
1359-6462
URI
https://pubs.kist.re.kr/handle/201004/120124
DOI
10.1016/j.scriptamat.2018.12.033
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KIST Article > 2019
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