|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Intermittent Plasticity Associated with Collective Motion of Dislocation in bcc Alloys
||Takahito Ohmura, Takuya Suzuki
|On-Site Speaker (Planned)
Nanoindentation-induced mechanical behavior was investigated in terms of intermittent plasticity based on collective motion of dislocation for bcc alloys. Strain burst so-called pop-in occurs with frequency on loading process and the event is dominated by two types of mechanisms. One corresponds to the first event during loading, which is understood as plasticity initiation under an extremely high stress in an order of ideal strength. The probability for a critical shear stress underneath an indenter shows Gaussian distribution, which suggests a thermally-activated mechanism. The other is second or later pop-in events as a motion of pre-existing dislocations. The probability represents a power function of the critical stress, which looks fractal like dislocation avalanche.
||Planned: Supplemental Proceedings volume