2026-10-30T02:11:59Zhttps://bayburt-rdlopen.rawdatalibrary.net/oai/requestoai:bayburt-rdlopen.rawdatalibrary.net:bayburt/124542026-10-29T19:42:28Zopenairecom_bayburt_10000col_bayburt_10001com_bayburt_10007col_bayburt_10223Effect of equal-channel angular pressing on room temperature superplasticity of quasi-single phase Zn-0.3Al alloyDemirtas, M.Purcek, G.Yanar, H.Zhang, Z.J.Zhang, Z.F.Dilute Zn-Al alloysFine-grained microstructureRoom temperature superplasticitySevere plastic deformationQuasi-single phase (dilute) Zn-0.3Al alloy was subjected to severe plastic deformation via equal-channel angular extrusion/pressing (ECAE/P), and the effects of ECAP on its room temperature (RT) and high strain rate (HSR) superplasticity and deformation mechanism were investigated. Multi-pass ECAP may refine the coarse-grained microstructure into the fine grained (FG) one. The grain size of Zn-matrix phase decreased down to 2.0m after ECAP. Many spherical Al-rich precipitates decomposed and homogeneously distributed inside the matrix phase. They are ultrafine grained (UFG) α-particles with the grain sizes ranging from 50nm to ~200nm. This special microstructure having FG and UFG micro-constituents brought about an improvement in RT superplasticity even at HSRs. While multi-pass ECAP decreased flow stress of the alloy, its elongation to failure increased substantially depending on the initial strain rates. The maximum elongation was 1000% at a low strain rate of 10-4s-1, and 350% elongation was achieved at a high strain rate of 10-2s-1. Grain boundary sliding (GBS) was found to be the main deformation mechanism in region-II as the optimum superplastic region.Elsevier Ltd2015Articlehttps://rdlopen.rawdatalibrary.net/r/bayburt/12454https://doi.org/10.1016/j.msea.2015.07.0410921-5093enMaterials Science and Engineering: Ainfo:eu-repo/semantics/closedAccessinfo:eu-repo/semantics/articlehttps://bayburt-rdlopen.rawdatalibrary.net/tr/items/bayburt/12454