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dc.contributor.authorPurcek, G.
dc.contributor.authorYapıcı, Güney Güven
dc.contributor.authorKaraman, I.
dc.contributor.authorMaier, H. J.
dc.date.accessioned2012-05-25T11:49:47Z
dc.date.available2012-05-25T11:49:47Z
dc.date.issued2011-03-15
dc.identifier.issn0921-5093
dc.identifier.urihttp://hdl.handle.net/10679/172
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0921509310013080
dc.descriptionDue to copyright restrictions, the access to the full text of this article is only available via subscription.en_US
dc.description.abstractTwo grades of commercial purity (CP) titanium (grades 2 and 4) were processed using equal-channel angular extrusion (ECAE) at 300 ◦C and 450 ◦C, respectively. The processing temperatures were the minimum temperatures at which eight pass ECAE could be performed without any shear-localization. The coarse-grained (CG) microstructures of as-received grade-2 and grade-4 CP-Ti, with average grain sizes of 110_m and 70_m, respectively, were refined down to sub-micron levels with a mean grain size of about 300nm for both grades after 8 ECAE passes. The ultrafine-grained (UFG) microstructures led to substantial enhancement in strength for both grades. The grade-2 sample showed a more than two fold increase in yield strength (_y), from 307MPa for the as-received one to about 620MPa for the processed samples. The grade-4 CP-Ti exhibited a relatively smaller increase in strength due to the higher processing temperature, and it showed about 50% increase in _y after eight pass ECAE, from 531 to 758 MPa. These strength levels were obtained with high ductility levels of 21% and 25% for UFG grade-2 and grade-4 Ti, respectively. These improvements in mechanical properties are attributed to the substantially refined grain size and increased dislocation density. Grade-4 Ti is stronger than grade-2 because of the higher oxygen content. The higher ductility and significantly higher strain hardening capability of UFG grade-4 Ti, in spite of the similar grain size and microstructure with UFG grade-2 Ti, is also due to the higher impurity content, probably resulting in a higher dislocation storage capability during room temperature deformation, and thus, higher strain hardening capacity. Such properties make UFG grade-4 Ti comparable to the commercial Ti–6Al–4V alloy for biomedical applications without negative effects of the alloying elements on biocompatibility.en_US
dc.description.sponsorshipNSF ; Karadeniz Technical University ; TÜBİTAK
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relationinfo:turkey/grantAgreement/TUBITAK/2219en_US
dc.relation.ispartofMaterials Science and Engineering A
dc.rightsrestrictedAccess
dc.titleEffect of commercial purity levels on the mechanical properties of ultrafine-grained titaniumen_US
dc.typeArticleen_US
dc.peerreviewedyesen_US
dc.publicationstatuspublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID(ORCID 0000-0001-5692-4809 & YÖK ID 163236) Yapıcı, Güven
dc.contributor.ozuauthorYapıcı, Güney Güven
dc.identifier.volume528
dc.identifier.issue6
dc.identifier.startpage2303
dc.identifier.endpage2308
dc.identifier.wosWOS:000287643200015
dc.identifier.doi10.1016/j.msea.2010.11.021
dc.subject.keywordsEqual-channel angular extrusion/pressingen_US
dc.subject.keywordsGrade-2 and grade-4 CP-Tien_US
dc.subject.keywordsUltrafine-grained materialsen_US
dc.subject.keywordsMicrostructureen_US
dc.subject.keywordsMechanical propertiesen_US
dc.identifier.scopusSCOPUS:2-s2.0-79151479884
dc.contributor.authorMale1


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