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dc.contributor.author장재일-
dc.date.accessioned2019-11-26T20:38:49Z-
dc.date.available2019-11-26T20:38:49Z-
dc.date.issued2017-07-
dc.identifier.citationJOURNAL OF ALLOYS AND COMPOUNDS, v. 711, page. 143-154en_US
dc.identifier.issn0925-8388-
dc.identifier.issn1873-4669-
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S0925838817311659?via%3Dihub-
dc.identifier.urihttps://repository.hanyang.ac.kr/handle/20.500.11754/114841-
dc.description.abstractAn equiatomic CoCrFeMnNi High-Entropy Alloy (HEA) produced by arc melting was processed by High Pressure Torsion (HPT). The evolution of the microstructure during HPT was investigated after 1/4, 1/2, 1 and 2 turns using electron backscatter diffraction and transmission electron microscopy. The spatial distribution of constituents was studied by energy-dispersive X-ray spectroscopy. The dislocation density and the twin-fault probability in the HPT-processed samples were determined by X-ray line profiles analysis. It was found that the grain size was gradually refined from similar to 60 mu m to similar to 30 nm while the dislocation density and the twin-fault probability increased to very high values of about 194 x 10(14) m(-2) and 2.7%, respectively, at the periphery of the disk processed for 2 turns. The hardness evolution was measured as a function of the distance from the center of the HPT-processed disks. After 2 turns of HPT, the micro hardness increased from similar to 1440 MPa to similar to 5380 MPa at the disk periphery where the highest straining is achieved. The yield strength was estimated as one-third of the hardness and correlated to the microstructure. (C) 2017 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipThis work was supported by the Hungarian Scientific Research Fund, OTKA, Grant No. K-109021. The authors are grateful to Mr. Gabor Varga and Dr. Zoltan Dankhazi for performing EBSD experiment. This work was also supported in part by the NRF Korea funded by MoE under Grant No. NRF-2016R1A6A1A03013422 and by MSIP under Grant No. NRF-2016K1A4A3914691 (MK) and in part by the National Science Foundation of the United States under Grant No. DMR-1160966 (TGL).en_US
dc.language.isoen_USen_US
dc.publisherELSEVIER SCIENCE SAen_US
dc.subjectHigh-Entropy Alloyen_US
dc.subjectHigh-Pressure Torsionen_US
dc.subjectX-ray diffractionen_US
dc.subjectDislocationsen_US
dc.subjectTwin faultsen_US
dc.subjectHardnessen_US
dc.titleDefect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsionen_US
dc.typeArticleen_US
dc.relation.volume711-
dc.identifier.doi10.1016/j.jallcom.2017.03.352-
dc.relation.page143-154-
dc.relation.journalJOURNAL OF ALLOYS AND COMPOUNDS-
dc.contributor.googleauthorHeczel, Anita-
dc.contributor.googleauthorKawasaki, Megumi-
dc.contributor.googleauthorLabar, Janos L.-
dc.contributor.googleauthorJang, Jae-il-
dc.contributor.googleauthorLangdon, Terence G.-
dc.contributor.googleauthorGubicza, Jeno-
dc.relation.code2017003338-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDIVISION OF MATERIALS SCIENCE AND ENGINEERING-
dc.identifier.pidjijang-
dc.identifier.researcherIDA-3486-2011-
dc.identifier.orcidhttp://orcid.org/0000-0003-4526-5355-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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