Micro-plasticity and recent insights from intermittent and small-scale plasticity

  title={Micro-plasticity and recent insights from intermittent and small-scale plasticity},
  author={Robert Maa{\ss} and Peter M. Derlet},
  journal={Acta Materialia},
Effects of Rate, Size, and Prior Deformation in Microcrystal Plasticity
Crystal plasticity of sub-micron finite volumes is characterized by the flow of emergent dislocation defects, giving rise to size effects in mechanical properties and avalanche phenomena. In this
Spatio-temporal plastic instabilities at the nano/micro scale
Recent experimental observations revealed the inherent nature of strong intermittent and heterogeneous plastic deformation at the nano- to micrometer scale. We present here a review of quantitative
Statistics and Mechanisms of Intermittent Plasticity in FCC and BCC Microcrystals
Plastic deformation in crystalline materials consists of an ensemble of collective dislocation glide processes, which lead to strain burst emissions in micro-scale samples. To unravel the combined
Scale-dependent pop-ins in nanoindentation and scale-free plastic fluctuations in microcompression
Nanoindentation and microcrystal deformation are two methods that allow probing size effects in crystal plasticity. In many cases of microcrystal deformation, scale-free and potentially universal
Fluctuations in crystalline plasticity
Recently acoustic signature of dislocation avalanches in HCP materials was found to be long tailed in size and energy, suggesting critical dynamics. Even more recently, the intermittent plastic
Grain-Size-Dependent Grain Boundary Deformation during Yielding in Nanocrystalline Materials Using Atomistic Simulations
While the advantageous mechanical properties of nanocrystalline (NC) materials have stimulated numerous studies over the past decade, fewer studies have looked at the onset of yielding and
Separation of Time Scales of Plastic Instabilities During Microscale Deformation of bcc Fe
During mechanical deformation of bcc Fe micropillars, a number of different plastic processes is activated, often leading to unstable plastic flow characterized by abrupt plastic discharges. While


Scale invariance in plastic flow of crystalline solids
From the traditional viewpoint of continuum plasticity, plastic deformation of crystalline solids is, at least in the absence of so-called plastic instabilities, envisaged as a smooth and
Micro-plasticity and intermittent dislocation activity in a simplified micro-structural model
Here we present a model to study the micro-plastic regime of a stress–strain curve. In this model an explicit dislocation population represents the mobile dislocation content and an internal
Taming intermittent plasticity at small scales
Probing Microplasticity in Small-Scale FCC Crystals via Dynamic Mechanical Analysis.
It is postulate that microplasticity, which is associated with the combination of dislocation avalanches and slow viscoplastic relaxations, is the cause of the dependency of dynamic modulus on the driving rate and the quasistatic stress.
Plasticity of Micrometer-Scale Single-Crystals in Compression: A Critical Review (PREPRINT)
Abstract : This review examines the recent literature that has focused on uniaxial compression experiments of single crystals at the micrometer-scale. Collectively, the studies discovered new regimes
The role of weakest links and system size scaling in multiscale modeling of stochastic plasticity
Plastic deformation of crystalline and amorphous matter often involves intermittent local strain burst events. To understand the physical background of the phenomenon a minimal stochastic mesoscopic
Connecting Local Yield Stresses with Plastic Activity in Amorphous Solids.
The sites of low local yield stress are shown to be persistent, remaining predictive of deformation events even after fifty or more such plastic rearrangements, reinforcing the relevance of modeling plasticity in amorphous solids based on a gradually evolving population of discrete and local zones preexisting in the structure.
Unravelling the physics of size-dependent dislocation-mediated plasticity
A generalized size-dependent dislocation-based model that predicts strength as a function of crystal/grain size and the dislocation density is developed and is shown to be in remarkable agreement with experiments.