Deformation Behavior and Microstructural Evolution of Cu–Ag Alloys Processed by High‐Pressure Torsion1. Issue 12 (29th May 2015)

• Record Type: Journal Article
• Authors: Kormout, Karoline S.; Yang, Bo; Pippan, Reinhard
• Is Part Of: Advanced engineering materials. Volume 17:Issue 12(2015:Dec.)
• Page Start: 1828
• Page End: 1834
• Publication Date: 2015-05-29
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500109
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : In this study, different Cu–Ag alloys (Cu‐10/25/50/75/90 wt%Ag) are produced by powder consolidation and subsequent high‐pressure torsion processing. The microstructural evolution of the material state is investigated by SEM and TEM. Additionally, mechanical properties are characterized by Vickers microhardness measurements. The deformation mechanism changes from homogenous co‐deformation in the very beginning of the process to shear banding. When the hardness reaches a saturation level, all compositions show grain sizes below 100 nm with a very high defect density and hardness compared to pure ultrafine‐grained Cu or Ag. Single‐phase solid solutions are reached at both high and low Ag content, in the medium composition range a mixture of single‐ and two‐phase regions is observed. Abstract : In order to investigate the deformation behavior of composites in immiscible systems, different Cu–Ag alloys are produced by high‐pressure torsion processing. Their microstructural evolution from lamellar ultrafine‐grained to nanocrystalline is analyzed and related to mechanical properties.