|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Slip Dynamics in Small-scale Crystals and the Transition from Intermittent to Smooth Flow
||Gregory Sparks, Robert Maass
|On-Site Speaker (Planned)
At the bulk scale, the signature of intermittent flow is generally not seen in stress-strain data, but it is directly visible as strain-discontinuities in flow curves of small-scale crystals. Statistical investigations of intermittent deformation reveal scale-invariance, which is a paradigm shift away from traditional concepts that homogenize plastic flow and rely on well-defined average quantities. In this talk, we will present recent observations made during mechanical characterization that trace plastic instabilities in small-scale crystals in real time. We will discuss results from fcc and bcc single crystals of different orientations, and focus on slip-velocity distributions, and avalanche shapes. Assessing the avalanche velocity-relaxation reveals unexpected differences between lattice types, giving first insights into aspects of intermittent plasticity that are not universal. We further discuss the appearance and disappearance of discrete plastic behavior at the small scale, and what implications this may have for macroscopic bulk plasticity.
||Planned: Supplemental Proceedings volume