Effect of commercial purity levels on the mechanical properties of ultrafine-grained titanium
dc.contributor.author | Purcek, G. | |
dc.contributor.author | Yapıcı, Güney Güven | |
dc.contributor.author | Karaman, I. | |
dc.contributor.author | Maier, H. J. | |
dc.date.accessioned | 2012-05-25T11:49:47Z | |
dc.date.available | 2012-05-25T11:49:47Z | |
dc.date.issued | 2011-03-15 | |
dc.identifier.issn | 0921-5093 | |
dc.identifier.uri | http://hdl.handle.net/10679/172 | |
dc.identifier.uri | http://www.sciencedirect.com/science/article/pii/S0921509310013080 | |
dc.description | Due to copyright restrictions, the access to the full text of this article is only available via subscription. | en_US |
dc.description.abstract | Two 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.sponsorship | NSF ; Karadeniz Technical University ; TÜBİTAK | |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.relation | info:turkey/grantAgreement/TUBITAK/2219 | en_US |
dc.relation.ispartof | Materials Science and Engineering A | |
dc.rights | restrictedAccess | |
dc.title | Effect of commercial purity levels on the mechanical properties of ultrafine-grained titanium | en_US |
dc.type | Article | en_US |
dc.peerreviewed | yes | en_US |
dc.publicationstatus | published | en_US |
dc.contributor.department | Özyeğin University | |
dc.contributor.authorID | (ORCID 0000-0001-5692-4809 & YÖK ID 163236) Yapıcı, Güven | |
dc.contributor.ozuauthor | Yapıcı, Güney Güven | |
dc.identifier.volume | 528 | |
dc.identifier.issue | 6 | |
dc.identifier.startpage | 2303 | |
dc.identifier.endpage | 2308 | |
dc.identifier.wos | WOS:000287643200015 | |
dc.identifier.doi | 10.1016/j.msea.2010.11.021 | |
dc.subject.keywords | Equal-channel angular extrusion/pressing | en_US |
dc.subject.keywords | Grade-2 and grade-4 CP-Ti | en_US |
dc.subject.keywords | Ultrafine-grained materials | en_US |
dc.subject.keywords | Microstructure | en_US |
dc.subject.keywords | Mechanical properties | en_US |
dc.identifier.scopus | SCOPUS:2-s2.0-79151479884 | |
dc.contributor.authorMale | 1 |
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