Browsing by Subject "Ultrafine-grained materials"

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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 ...
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. ...