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dc.contributor.authorMegumi Kawasaki-
dc.date.accessioned2017-08-11T01:28:23Z-
dc.date.available2017-08-11T01:28:23Z-
dc.date.issued2015-10-
dc.identifier.citationJOURNAL OF MATERIALS SCIENCE, v. 50, NO 20, Page. 6700-6712en_US
dc.identifier.issn0022-2461-
dc.identifier.issn1573-4803-
dc.identifier.urihttps://link.springer.com/article/10.1007%2Fs10853-015-9224-5-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/28478-
dc.description.abstractAn Al-33 % Cu eutectic alloy was processed by high-pressure torsion (HPT) at room temperature under a compressive pressure of 6.0 GPa for different revolutions up to 10 turns. The Vickers microhardness and microstructure were investigated on vertical cross sections of the disks to evaluate the evolution toward homogeneity with increasing numbers of HPT turns. The hardness behavior follows the strain hardening model of materials after HPT processing and the microstructural development confirms that there is essentially a compatibility between hardness and microstructure in the Al-Cu alloy when processing by HPT. The tensile properties were examined at a high temperature of 723 K after 5 and 10 turns of HPT using a series of strain rates from 3.3 x 10(-5) to 1.0 x 10(-1) s(-1). Excellent superplastic ductilities were achieved when testing at strain rates below 1.0 x 10(-3) s(-1) with a highest elongation of similar to 1220 % after 10 turns at an initial strain rate of 1.0 x 10(-4) s(-1). Close inspection showed that the optimal superplastic strain rates are displaced to a faster strain rate with increasing revolutions from 5 to 10 turns. A deformation mechanism map was constructed for a testing temperature of 723 K using a combination of theoretical relationships and earlier experimental data reported for a conventional coarse-grained Al-33 % Cu alloy. Inspection shows that this map is in excellent agreement with the experimental data for the ultrafine-grained Al-33 % Cu alloy after processing by HPT.en_US
dc.description.sponsorshipThis work was supported in part by the NRF Korea funded by MoE under Grant No. NRF-2014R1A1A2057697 (MK), in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (TGL).en_US
dc.language.isoenen_US
dc.publisherSPRINGERen_US
dc.subjectULTRAFINE-GRAINED MATERIALSen_US
dc.subjectSEVERE PLASTIC-DEFORMATIONen_US
dc.subjectMECHANICAL-PROPERTIESen_US
dc.subjectHARDNESS EVOLUTIONen_US
dc.subjectPURE ALUMINUMen_US
dc.subjectCUen_US
dc.subjectMETALSen_US
dc.subjectCREEPen_US
dc.subjectFLOWen_US
dc.subjectREFINEMENTen_US
dc.titleMicrostructural homogeneity and superplastic behavior in an aluminum-copper eutectic alloy processed by high-pressure torsionen_US
dc.typeArticleen_US
dc.relation.no20-
dc.relation.volume50-
dc.identifier.doi10.1007/s10853-015-9224-5-
dc.relation.page6700-6712-
dc.relation.journalJOURNAL OF MATERIALS SCIENCE-
dc.contributor.googleauthorKawasaki, Megumi-
dc.contributor.googleauthorLee, Han-Joo-
dc.contributor.googleauthorLangdon, Terence G.-
dc.relation.code2015000762-
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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