Journal
SCRIPTA MATERIALIA
Volume 163, Issue -, Pages 24-28Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.12.033
Keywords
High-entropy alloy; Particle strengthening; Grain boundary strengthening; High-pressure torsion; Nanoindentation
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2015R1A5A1037627, 2017R1A2B4012255]
- National Science Foundation of the United States [DMR-1810343]
- National Research Foundation of Korea [2017R1A2B4012255] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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