Ultrafine-grained interstitial-free steel fabricated by the accumulative roll-bonding method was subjected to tensile tests and analyses of AFM, TEM and XRD to identify the effects of interaction between dislocations and grain boundaries (GB) on the deformation mechanism. The AFM analyses indicated that the main deformation mechanism of this material changed from dislocation motion to grain boundary sliding (GBS) with decreasing strain rate. TEM observations and XRD analysis revealed showed that dislocations piled up at GB and the dislocation density decreased with increasing strain. Those suggest the dislocations are absorbed into GB during deformation, activating slip-induced GBS.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 2014|
|Event||6th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD 2014 - Metz, France|
Duration: 2014 Jun 30 → 2014 Jul 4
ASJC Scopus subject areas
- Materials Science(all)