Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
771229 | Engineering Fracture Mechanics | 2008 | 9 Pages |
Abstract
The strain rate sensitivity (m) was determined as a function of the strain rate using mechanical jump tests, on a nanostructured copper (grain size of 90 nm) prepared by powder metallurgy. The largest value is m = 0.050 ± 0.005, measured at 1 × 10−5 s−1. Apparent activation volume was derived giving an insight of the micromechanisms involved in the plastic deformation. Nanostructured face centred cubic metals exhibit elongation due to their strain rate sensitivity and the related delay in the localisation of the deformation. The present analysis brings elements of the micromechanism involved in the plasticity, providing with the guide to design a relevant ultra-fine grained architecture with improved ductility.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Yannick Champion, Cyril Langlois, Sandrine Guérin, Cécilie Duhamel,