Grain-Size Effect on the Properties of Materials under Dynamic Deformation

摘要

Some deformation features in fine-grained copper under gradient dynamic stresses are studied which provide a better understanding of the mechanism of the processes involved. The experimentally observed abrupt change in the properties of materials with grain sizes smaller than a certain critical value is shown to be related to inter-granular slip during deformation. Materials with a grain size of 5—50 μm are found to exhibit properties characteristic of nanomaterials with a strain rate varying from 10~4 to 3 · 10~6 sec~(-1).