| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
O-48: The Interaction of Point Defects with Stress Fields Generated by Persistent Slip Bands in f.c.c. Nickel |
| Author(s) |
Leslie T. Mushongera, Pankaj Kumar, Michael Sangid |
| On-Site Speaker (Planned) |
Leslie T. Mushongera |
| Abstract Scope |
A glance at available literature on mechanisms determining the characteristics of persistent slip bands (PSB) reveals that the subject remains fascinating, with many unresolved issues and disparate observations. The volumetric swelling of PSBs is one area where stipulated bridging between theory and experiments is yet to establish. We use a phase-field model to study the volumetric swelling of PSBs in nominally defect-free pure f.c.c metals. The scale of observation envisioned is that of PSBs intersecting a single crystal. The PSBs are regarded as a result of spontaneous evolution of localized dissipative structures in the form of solitary static regions. Basic building blocks of the theory are: a model of cyclic plasticity tailored to PSBs, coupled to a model of vacancy diffusion which accounts for volume diffusion, pipe diffusion. Our numerical simulations show that the flux of vacancies contributes to volumetric swelling and local damage in the vicinity the PSB/matrix interface. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |