| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Strain-Rate Dependence of Flow Stress Hardened by Annealing and Softened by Deformation in Nanostructured Aluminum Processed by Accumulative Roll-Bonding |
| Author(s) |
Takahiro Kunimine, Si Gao, Ryoichi Monzen, Nobuhiro Tsuji |
| On-Site Speaker (Planned) |
Takahiro Kunimine |
| Abstract Scope |
Nanostructured metals can be hardened by low-temperature annealing and softened by subsequent deformation. It has been reported that the decreased mobile-dislocation density caused by low-temperature annealing led to the hardening of the nanostructured materials. Here, we report on the strain-rate dependence of flow stress hardened by annealing and softened by subsequent deformation in nanostructured aluminum processed by accumulative roll-bonding (ARB). Strain-rate sensitivity and activation volume of the nanostructured aluminum with or without subsequent annealing were measured by stress relaxation tests. Deformation mechanisms for the phenomena of “hardening by annealing and softening by deformation” in the nanostructured aluminum were discussed based on the experimental results in terms of thermally activated dislocation process. To explain the phenomena, an analysis was attempted with the combination of the Taylor-type dislocation strengthening model and the dislocation bow-out model from grain boundary, which was proposed for yield stress in ultrafine-grained and nanocrystalline metals. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |