Effect of Chemical Composition and Grain Size on RT Superplasticity of Zn-Al alloys processed by ECAP

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dc.contributor.authorDemirtas, M.
dc.contributor.authorPurcek, G.
dc.contributor.authorYanar, H.
dc.contributor.authorZhang, Z. J.
dc.contributor.authorZhang, Z. F.
dc.date.accessioned2024-10-04T18:49:34Z
dc.date.available2024-10-04T18:49:34Z
dc.date.issued2015
dc.departmentBayburt Üniversitesien_US
dc.description.abstractDilute Zn-0.3Al, eutectic Zn-5Al and eutectoid Zn-22Al alloys were processed by multi-pass equal channel angular pressing (ECAP) in order to achieve fine grained (FG) or ultrafine-grained (UFG) microstructure and room temperature (RT) superplasticity. ECAP refined the microstructure of Zn-0.3Al and resulted in a FG Zn-rich.-matrix with an average grain size of 2 mu m and homogeneously distributed nano-sized Al-rich a-particles with the grain sizes in the range of 50-200 nm. A bi-modal microstructure was achieved in Zn-5Al alloy with UFG Al-rich a-and FG Zn-rich.-phases having mean grain sizes of 110 nm and 540 nm, respectively. ECAP brought about an agglomerate-free UFG microstructure in Zn-22Al alloy with an average grain size of 200 nm which is the lowest one obtained so far for this alloy after ECAP processing. The maximum RT superplastic elongations of 1000%, 520% and 400% were achieved for Zn-0.3Al, Zn-5Al and Zn-22Al alloys, respectively. Considering the RT superplasticity in Zn-Al alloys, it was found that lower Al content results in higher superplastic elongations even if the alloy has relatively larger grain size. Grain boundary sliding (GBS) was found to be the main deformation mechanism in region-II as the optimum superplastic region during RT deformation for all three Zn-Al alloys with the strain rate sensitivity factor ranging between 0.25-0.31.en_US
dc.description.sponsorshipScientific Research Projects of Karadeniz Technical University, Turkey [10501]en_US
dc.description.sponsorshipThis research was supported by Scientific Research Projects of Karadeniz Technical University, Turkey, under Grant no: 10501.en_US
dc.identifier.endpage334en_US
dc.identifier.issn2218-5046
dc.identifier.issn2410-3535
dc.identifier.issue3en_US
dc.identifier.startpage328en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12403/3211
dc.identifier.volume5en_US
dc.identifier.wosWOS:000410109300017en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherRussian Acad Sciences, Inst Metals Superplasticity Problemsen_US
dc.relation.ispartofLetters On Materials-Pis Ma O Materialakhen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectZn-Al alloysen_US
dc.subjectroom temperature superplasticityen_US
dc.subjectultrafine-grained materialsen_US
dc.subjectequal channel angular pressingen_US
dc.titleEffect of Chemical Composition and Grain Size on RT Superplasticity of Zn-Al alloys processed by ECAPen_US
dc.typeArticleen_US

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