Browsing by Author "Yanar H."
Now showing items 1-13 of 13
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Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion
Demirtas M.; Purcek G.; Yanar H.; Zhang Z.J.; Zhang Z.F. (Elsevier Ltd, 2015)Multi-pass equal-channel angular extrusion/pressing (ECAE/P) was applied to the eutectic Zn-5Al alloy to achieve high strain-rate (HSR) superplasticity in that alloy at room temperature (RT) by producing ultrafine-grained ... -
Effect of different processes on lamellar-free ultrafine grain formation, room temperature superplasticity and fracture mode of Zn-22Al alloy
Demirtas M.; Purcek G.; Yanar H.; Zhang Z.J.; Zhang Z.F. (Elsevier Ltd, 2016)The Zn-22 wt.%Al was processed using five different selected routes including thermal, thermo-mechanical and severe plastic deformation (SPD) techniques in order to produce ultrafine grained (UFG) microstructure for achieving ... -
Effect of equal-channel angular pressing on room temperature superplasticity of quasi-single phase Zn-0.3Al alloy
Demirtas M.; Purcek G.; Yanar H.; Zhang Z.J.; Zhang Z.F. (Elsevier Ltd, 2015)Quasi-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) ... -
Effect of grain refinement and phase composition on room temperature superplasticity and damping capacity of dual-phase Zn-Al alloys
Demirtas M.; Atli K.C.; Yanar H.; Purcek G. (Cambridge University Press, 2018)The effects of grain refinement and phase composition on superplasticity and damping capacity of eutectic Zn-5Al and eutectoid Zn-22Al alloys were investigated. For grain refinement, equal-channel angular pressing (ECAP) ... -
Effect of natural aging on RT and HSR superplasticity of ultrafine grained Zn-22Al alloy
Demirtas M.; Purcek G.; Yanar H.; Zhang Z.; Zhang Z.-F. (Trans Tech Publications Ltd, 2016)Zn–22Al alloy was processed using a well-designed two-step equal channel angular extrusion/pressing (ECAE/P), and ultrafine-grained (UFG) microstructure with 200 nm grain size was achieved. UFG Zn-22Al was subjected to ... -
Effect of resin content on tribological behavior of brake pad composite material
Yanar H.; Ayar H.H.; Demirtas M.; Purcek G. (Emerald Group Publishing Ltd., 2018)Purpose: This paper aims to investigate the effect of straight phenolic resin content on the fade behavior, frictions and wear characteristics of pre-determined brake pad composite matrix having specific amount of barite ... -
Enhancing the Damping Behavior of Dilute Zn-0.3Al Alloy by Equal Channel Angular Pressing
Demirtas M.; Atli K.C.; Yanar H.; Purcek G. (Springer Boston, 2017)The effect of grain size on the damping capacity of a dilute Zn-0.3Al alloy was investigated. It was found that there was a critical strain value (?1 × 10 ?4 ) below and above which damping of Zn-0.3Al showed dynamic and ... -
High temperature superplasticity and deformation behavior of naturally aged Zn-Al alloys with different phase compositions
Demirtas M.; Kawasaki M.; Yanar H.; Purcek G. (Elsevier Ltd, 2018)Two Zn-Al alloys, eutectoid Zn-22Al and dilute Zn-0.3Al, were processed through equal-channel angular pressing (ECAP). The ECAP-processed alloys were subjected to long-term natural aging at room temperature for 120 days ... -
Improvement of high strain rate and room temperature superplasticity in Zn-22Al alloy by two-step equal-channel angular pressing
Demirtas M.; Purcek G.; Yanar H.; Zhang Z.J.; Zhang Z.F. (Elsevier Ltd, 2014)The Zn-22Al alloy was subjected to equal-channel angular pressing (ECAP) to improve its high strain rate (HSR) superplasticity at room temperature (RT). A well-designed two-step ECAP process formed an ultrafine-grained ... -
Influence of high pressure torsion-induced grain refinement and subsequent aging on tribological properties of Cu-Cr-Zr alloy
Purcek G.; Yanar H.; Shangina D.V.; Demirtas M.; Bochvar N.R.; Dobatkin S.V. (Elsevier Ltd, 2018)Effects of ultrafine grain formation via high pressure torsion (HPT) and precipitation during aging on the microstructure, mechanical and tribological properties of a Cu-Cr-Zr alloy have been investigated systematically. ... -
Optimization of RT superplasticity of UFG Zn-22Al alloy by applying ECAP at different temperatures and phase regions
Demirtas M.; Yanar H.; Purcek G. (Institute of Physics Publishing, 2017)Zn-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 ... -
Optimization of strength, ductility and electrical conductivity of Cu-Cr-Zr alloy by combining multi-route ECAP and aging
Purcek G.; Yanar H.; Demirtas M.; Alemdag Y.; Shangina D.V.; Dobatkin S.V. (Elsevier Ltd, 2016)Properties of Cu-Cr-Zr alloy with ultrafine-grained (UFG) structure produced by equal-channel angular pressing (ECAP) via different routes have been investigated. Special attention was paid to the optimization of ... -
Room temperature superplasticity in fine/ultrafine-grained Zn-Al alloys with different phase compositions
Demirtas M.; Yanar H.; Saray O.; Purcek G. (Trans Tech Publications Ltd, 2018)Three Zn-Al alloys, namely Zn-22Al, Zn-5Al and Zn-0.3Al, were subjected to equal-channel angular pressing (ECAP), and the effect of ECAP on their microstructure and room temperature (RT) superplastic behavior were investigated ...
