| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
N-37: Nucleation, Growth and Coarsening of Precipitates in Immiscible Alloys during Low-temperature Severe Plastic Deformation: Gibbs-Thomson Behavior |
| Author(s) |
Nirab Pant, Yinon Ashkenazy, Nisha Verma, Robert Averback |
| On-Site Speaker (Planned) |
Nirab Pant |
| Abstract Scope |
Severe plastic deformation (SPD) of strongly-immiscible alloys such as dilute Cu-Nb and Cu-Mo leads to novel steady-state microstructures featuring nanoprecipitates with a self-selected size distribution and a super-saturation of solute atoms in the matrix. While there have been various models proposed for how large precipitates might shrink under shear deformation, little work has considered how small precipitates nucleate and grow during SPD, particularly at low temperatures where thermally activated diffusion is negligible. Here, we demonstrate using molecular dynamics simulations that low-temperature SPD can be described within an effective temperature model, and that a key prediction of this model is Gibbs-Thomson (G-T) behavior. While G-T behavior does lead to the growth and coarsening of precipitates, the simulations also show that agglomeration of precipitates is the dominant growth mechanism. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |