Demirtas M.Yanar H.Purcek G.20.04.20192019-04-2020.04.20192019-04-2020171757-8981https://dx.doi.org/10.1088/1757-899X/194/1/012033https://hdl.handle.net/20.500.12403/4987th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD 2017Zn-22Al alloy was subjected to either one-step or two-step equal channel pressing (ECAP) to investigate the effect of processing temperature on its microstructure and room temperature (RT) superplasticity. In one-step ECAP processes, 4 passes ECAP were applied to the alloy at different temperatures: RT, 100°C and 250°C in two-phase region below eutectoid temperature and 350°C in single-phase region above eutectoid temperature. In two-step ECAP processes, one-step ECAP-processed samples were subjected to four more passes ECAP at RT. Considering the one-step ECAP processing, RT superplasticity increased with decreasing ECAP temperature as expected, and the highest RT superplasticity was achieved as 350% after 4 passes ECAP at RT. On the other hand, application of 4 more passes ECAP at RT to the sample showing the lowest superplastic elongation after one-step ECAP (the sample processed at 350°C) resulted in the maximum RT elongation of 400% at a high strain rate of 5×10-2 s-1. These results suggest that first step temperature of two-step ECAP process is needed to increase above the eutectoid point of Zn-22Al alloy to achieve high RT superplasticity. These results were attributed to the changes in microstructure inside the single-phase and two-phase regions during the processes. © Published under licence by IOP Publishing Ltd.eninfo:eu-repo/semantics/openAccessAluminumMicrostructureNanostructured materialsPlastic deformationProcessingStrain rateSuperplasticityZincECAP processingEqual-channelHigh strain ratesPhase regionProcessing temperatureSingle phase regionSuperplastic elongationTwo-phase regionEqual channel angular pressingAluminumMicrostructureNanostructured materialsPlastic deformationProcessingStrain rateSuperplasticityZincECAP processingEqual-channelHigh strain ratesPhase regionProcessing temperatureSingle phase regionSuperplastic elongationTwo-phase regionEqual channel angular pressingConference Object194110.1088/1757-899X/194/1/0120332-s2.0-85019760568N/AWOS:000411380900033N/A