Effect of long-term natural aging on microstructure and room temperature superplastic behavior of UFG/FG Zn-Al alloys processed by ECAP

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dc.authoridPurcek, Gencaga/0000-0002-4726-2257
dc.authoridDemirtas, Muhammet/0000-0002-7357-3892
dc.contributor.authorDemirtas, M.
dc.contributor.authorYanar, H.
dc.contributor.authorPurcek, G.
dc.date.accessioned2024-10-04T18:49:35Z
dc.date.available2024-10-04T18:49:35Z
dc.date.issued2018
dc.departmentBayburt Üniversitesien_US
dc.description.abstractTwo potential superplastic compositions of Zn-Al alloy systems, Zn-22Al and Zn-0.3Al alloys, were chosen and processed by equal-channel angular pressing /extrusion (ECAP /E) in order to achieve high strain rate (HSR) superplasticity at room temperature (RT). ECAP-processed samples of both alloys were then subjected to long-term natural aging up to 1100 days to evaluate the effect of long-term natural aging on their microstructures and superplastic behaviors. Before natural aging, the maximum elongations to failure at RT were 400 % for ultrafine-grained (UFG) Zn-22Al at the strain rate of 5 x 10(-2) s(-1) and 1000 % for fine-grained (FG) Zn-0.3Al at the strain rate of 1 x 10(-4) s(-1). Long-term natural aging did not cause a significant change in the elongation of UFG Zn-22Al alloy with 355 % maximum elongation. However, optimum strain rate giving the maximum elongation decreased to 3 x 10(-3) s(-1). On the other hand, Zn-0.3Al alloy lost more than half of its superplastic elongation and showed an elongation to failure of 435 % at the end of the natural aging period of 1100 days. Microstructural analyses show that grain boundary corrosion occurred in dilute Zn-0.3Al alloy during the natural aging process. Corroded grain boundaries resulted in cavity nucleation during the tensile tests and some of these cavities attained large sizes and caused premature failure.en_US
dc.description.sponsorshipScientific Research Projects of Karadeniz Technical University, Turkey [10501]; World Academy of Sciences (TWAS) under the Visiting Researchers program of TWAS-UNESCO Associateship Schemeen_US
dc.description.sponsorshipThe authors are grateful to Prof. Zhe-Feng Zhang (Chinese Academy of Sciences) for his helpful aids on TEM analysis. This research was partially supported by Scientific Research Projects of Karadeniz Technical University, Turkey, under Grant No: 10501. Dr. G. Purcek was also supported by The World Academy of Sciences (TWAS) under the Visiting Researchers program of TWAS-UNESCO Associateship Scheme.en_US
dc.identifier.doi10.22226/2410-3535-2018-4-532-537
dc.identifier.endpage537en_US
dc.identifier.issn2218-5046
dc.identifier.issn2410-3535
dc.identifier.issue4en_US
dc.identifier.scopus2-s2.0-85064953771en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage532en_US
dc.identifier.urihttps://doi.org/10.22226/2410-3535-2018-4-532-537
dc.identifier.urihttp://hdl.handle.net/20.500.12403/3222
dc.identifier.volume8en_US
dc.identifier.wosWOS:000457554700005en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherRussian Acad Sciences, Inst Metals Superplasticity Problemsen_US
dc.relation.ispartofLetters On Materialsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectroom temperature superplasticityen_US
dc.subjectZn-Al alloysen_US
dc.subjectnatural agingen_US
dc.subjectultrafine-grained materialsen_US
dc.subjectECAPen_US
dc.titleEffect of long-term natural aging on microstructure and room temperature superplastic behavior of UFG/FG Zn-Al alloys processed by ECAPen_US
dc.typeArticleen_US

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