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dc.contributor.authorMegumi Kawasaki-
dc.date.accessioned2017-05-22T06:49:40Z-
dc.date.available2017-05-22T06:49:40Z-
dc.date.issued2015-09-
dc.identifier.citationJOURNAL OF MATERIALS RESEARCH, v. 30, NO 18, Page. 2804-2815en_US
dc.identifier.issn0884-2914-
dc.identifier.issn2044-5326-
dc.identifier.urihttps://www.cambridge.org/core/journals/journal-of-materials-research/article/nanomechanical-behavior-and-structural-stability-of-a-nanocrystalline-cocrfenimn-highentropy-alloy-processed-by-highpressure-torsion/9E813EE69E261F8D7263C5D1634392AE-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/27388-
dc.description.abstractA CoCrFeNiMn high-entropy alloy (HEA), in the form of a face-centered cubic (fcc) solid solution, was processed by high-pressure torsion (HPT) to produce a nanocrystalline(nc) HEA. Significant grain refinement was achieved from the very early stage of HPT through 1/4 turn and an nc structure with an average grain size of similar to 40 nm was successfully attained after 2 turns. The feasibility of significant microstructural changes was attributed to the occurrence of accelerated atomic diffusivity under the torsional stress during HPT. Nanoindentation experiments showed that the hardness increased significantly in the nc HEA during HPT processing and this was associated with additional grain refinement. The estimated values of the strain-rate sensitivity were maintained reasonably constant from the as-cast condition to the nc alloy after HPT through 2 turns, thereby demonstrating a preservation of plasticity in the HEA. In addition, a calculation of the activation volume suggested that the grain boundaries play an important role in the plastic deformation of the nc HEA where the flow mechanism is consistent with other nc metals. Transmission electron microscopy showed that, unlike conventional fcc nc metals, the nc HEA exhibits excellent microstructural stability under severe stress conditions.en_US
dc.description.sponsorshipThe research of JIJ and DHL was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2013R1A1A2A10058551), and in part by the Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (No. 20134030200360). The work of MK was supported in part by the NRF Korea funded by MoE under Grant No. NRF-2014R1A1A2057697. The work of TGL was supported by the National Science Foundation of the United States under Grant No. DMR-1160966 and by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.en_US
dc.language.isoenen_US
dc.publisherCAMBRIDGE UNIV PRESSen_US
dc.subjectSTRAIN-RATE SENSITIVITYen_US
dc.subjectSEVERE PLASTIC-DEFORMATIONen_US
dc.subjectMECHANICAL-PROPERTIESen_US
dc.subjectACTIVATION VOLUMEen_US
dc.subjectGRAIN-REFINEMENTen_US
dc.subjectROOM-TEMPERATUREen_US
dc.subjectMETALSen_US
dc.subjectEVOLUTIONen_US
dc.subjectCUen_US
dc.subjectNANOINDENTATIONen_US
dc.titleNanomechanical behavior and structural stability of a nanocrystalline CoCrFeNiMn high-entropy alloy processed by high-pressure torsionen_US
dc.typeArticleen_US
dc.relation.no18-
dc.relation.volume30-
dc.identifier.doi10.1557/jmr.2015.239-
dc.relation.page2804-2815-
dc.relation.journalJOURNAL OF MATERIALS RESEARCH-
dc.contributor.googleauthorLee, Dong-Hyun-
dc.contributor.googleauthorChoi, In-Chul-
dc.contributor.googleauthorSeok, Moo-Young-
dc.contributor.googleauthorHe, Junyang-
dc.contributor.googleauthorLu, Zhaoping-
dc.contributor.googleauthorSuh, Jin-Yoo-
dc.contributor.googleauthorKawasaki, Megumi-
dc.contributor.googleauthorLangdon, Terence G.-
dc.contributor.googleauthorJang, Jae-il-
dc.relation.code2015000761-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDIVISION OF MATERIALS SCIENCE AND ENGINEERING-
dc.identifier.pidmegumi-
dc.identifier.researcherIDA-1872-2010-
dc.identifier.orcidhttp://orcid.org/0000-0003-0028-3007-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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