| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Transition from Source- to Stress-controlled Plasticity in Nanotwinned Materials below a Softening Temperature |
| Author(s) |
S. Mohadeseh Taheri-Mousavi, Haofei Zhou, Guijin Zou, Huajian Gao |
| On-Site Speaker (Planned) |
S. Mohadeseh Taheri-Mousavi |
| Abstract Scope |
Nanotwined metals are interesting for structural applications as they exhibit simultaneous high strength and ductility. However, little is known about the temperature dependency of such unique mechanical properties. Atomistic simulations and theoretical modeling of nanotwinned (nt) Pd and Cu systems have led to a discovery that there exists a softening temperature, below which the material hardens continuously as the twin thickness is reduced (as in nt-ceramics), while above which the strength first increases and then decreases, exhibiting a maximum strength and a hardening to softening transition at a critical twin thickness (as in nt-Cu). This important phenomenon has been attributed to a transition from source- to stress-controlled plasticity below the softening temperature, and suggests that different hardening behaviors may exist even in the same nt-material depending on the temperature and that at a given temperature different materials could exhibit different hardening behaviors depending on their softening temperature. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |