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.
|ジャーナル||IOP Conference Series: Materials Science and Engineering|
|出版ステータス||Published - 2014|
|イベント||6th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD 2014 - Metz, France|
継続期間: 2014 6 30 → 2014 7 4
ASJC Scopus subject areas
- Materials Science(all)