|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Deformation Mechanisms and Microstructural Evolution in Cu-Ag Alloys Produced by High-pressure Torsion
||Karoline Sophie Kormout, Zaoli Zhang, Bo Yang, Reinhard Pippan
|On-Site Speaker (Planned)
||Karoline Sophie Kormout
In this study different Cu-Ag alloys (Cu-10/25/50/75/90wt%Ag) are produced by powder consolidation and subsequent HPT processing. The microstructural evolution is investigated by SEM and TEM. In the beginning of the shear process Cu and Ag powder particles are co-deforming, both phases are homogenously refined and a lamellar structure is formed. When a certain strain level is reached the occurrence of shear bands is observed and a further strong refinement of the structure takes place. At very high shear strains (γ>2500) nanocrystalline microstructures are found in all alloys, which show no clear grain structure and very high defect densities. Evaluating diffraction data indicates, that at low and high Ag contents homogenous single-phase supersaturated solid solutions are obtained to a large extent. In the medium composition range a composite of single-phase and two-phase Cu-rich and Ag-rich supersaturated regions is observed. Special attention is paid on the deformation mechanisms at very high strains.