| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Solid Phase Processing Symposium
|
| Presentation Title |
Plastic Flow Instability, Surface Folding and a Mechanochemical Effect in Large Strain Deformation of Metals |
| Author(s) |
Srinivasan Chandrasekar, Anirudh Udupa, Tatsuya Sugihara, Koushik Viswanathan, James B Mann |
| On-Site Speaker (Planned) |
Srinivasan Chandrasekar |
| Abstract Scope |
Utilizing high-speed in situ imaging and a model 2-D deformation system, we explore evolution of plastic flow at surfaces in large strain deformation of highly strain-hardening metals. We demonstrate the occurrence of a plastic buckling stability that triggers a highly redundant flow mode - sinuous flow - characterized by large-amplitude folding and large energy dissipation. Key features of the sinuous flow field and buckling are elucidated, quantitatively. We show that the sinuous flow can be suppressed and replaced by a much more favorable (low-energy) flow mode, by application of very thin surface-active films that effect a local ductile-to-brittle transition in the deformation. Implications of this mechanochemical effect for cutting and deformation processing of metals, and for environmentally-assisted cracking are discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |