Lee, Dong-Hyun Park, Jeong-Min Yang, Guanghui He, Junyang Lu, Zhaoping Suh, Jin-Yoo Kawasaki, Megumi Ramamurty, Upadrasta Jang, Jae-il 2024-01-19T20:30:24Z 2024-01-19T20:30:24Z 2021-09-02 2019-04-01 1359-6462 https://pubs.kist.re.kr/handle/201004/120124 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. English PERGAMON-ELSEVIER SCIENCE LTD COARSE 2ND-PHASE PARTICLES SEVERE PLASTIC-DEFORMATION HALL-PETCH RELATIONSHIP MECHANICAL-PROPERTIES ACTIVATION VOLUME RATE SENSITIVITY PHASE-STABILITY NANOCRYSTALLINE BEHAVIOR MICROSTRUCTURE Nano-graining a particle-strengthened high-entropy alloy Article 10.1016/j.scriptamat.2018.12.033 1 SCRIPTA MATERIALIA, v.163, pp.24 - 28 SCRIPTA MATERIALIA 163 24 28 scie scopus 000458940000006 2-s2.0-85059459330 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Metallurgy & Metallurgical Engineering Article 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