|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Microstructural Refinement, Rate Sensitivity and Structural Stability of Cu-X Solid Solutions after Severe Plastic Deformation
||Karsten Durst, Enrico Bruder
|On-Site Speaker (Planned)
In this work the mechanical properties and structural refinement in Cu-Al, Cu-Sn and Cu-Zn solid solutions is studied after Severe Plastic Deformation (SPD). The mechanical properties like solid-solution-strengthening, work hardening rate and strain-rate-sensitivity are assessed for ufg and coarse-grained material, using both macroscopic and Nanoindentation approaches. Interestingly, the solid solutions show a strong indentation size effect, indicating a pronounced work hardening during indentation testing. This correlates well with the uniaxial mechanical properties and the observed grain refinement during SPD. Furthermore, the strain-rate-sensitivity of the highest solute content alloy is the smallest, even though the material exhibits the smallest grain size. Besides grain size also other factors governed by solid-solution-strengthening are contributing to the strain-rate-sensitivity of the nc-alloys. The paper will discuss the mechanism leading to grain refinement in conjunction with dislocation mechanism at grain boundaries, causing both a relatively low rate sensitivity and a strong refinement during SPD processing.