2019
DOI: 10.1103/physrevmaterials.3.080601
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Avalanche statistics and the intermittent-to-smooth transition in microplasticity

Abstract: Plastic flow at small scales is generally observed to be intermittent, whereas the stress-strain behavior of bulk crystals is mostly smooth. Here we find that when the external deformation rate of small-scale crystals approaches the speed of the crystallographic slip velocity, an intermittent-to-smooth transition of plastic flow is observed. By defining a rate-dependent intermittency parameter, this phenomenon can be captured with a power law covering 5.5 orders of magnitude for Au and Nb micron-sized single c… Show more

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Cited by 18 publications
(10 citation statements)
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“…The coexistence of a power-law range at small scales, with a separate peak representing system size events, is typical for spinodal criticality [47]. We note that the statistical supercriticality of nanoscale samples was not emphasized in the previous studies of the scaling in submicron crystals [16,48,49]. Instead, it was stressed that in almost pure crystals with negligible number of dislocations, for instance, in submicron and nanoparticles [20,21], nanowires [50], or submicron pillars [22,51], the plastic deformation culminates with the formation of a system size slip band.…”
Section: Methodsmentioning
confidence: 71%
See 1 more Smart Citation
“…The coexistence of a power-law range at small scales, with a separate peak representing system size events, is typical for spinodal criticality [47]. We note that the statistical supercriticality of nanoscale samples was not emphasized in the previous studies of the scaling in submicron crystals [16,48,49]. Instead, it was stressed that in almost pure crystals with negligible number of dislocations, for instance, in submicron and nanoparticles [20,21], nanowires [50], or submicron pillars [22,51], the plastic deformation culminates with the formation of a system size slip band.…”
Section: Methodsmentioning
confidence: 71%
“…3(b) and Fig. 4(b)] is often not explicitly indicated [16,48,49] even though it is well known that almost pure nano-and microcrystals always deform with a system-size dislocational avalanche [20][21][22]50]. The supercriticality is also suppressed by the neglect of dislocation nucleation in DDD simulations, even though the exponent τ ∼ 1 emerges in such models when they rely on the assumption of single-slip plasticity and neglect disorder (e.g., Ref.…”
Section: Avalanche Statisticsmentioning
confidence: 99%
“…In fact, that our model can naturally capture all this variability is a principal reason why we can tackle complex problems such as the present one. No intermittent flow can occur in our simulations from confined-volume plasticity [63][64][65][66][67] , and thus all instances of jerky flow can only be caused by dislocation-solute interactions.…”
Section: Methodsmentioning
confidence: 99%
“…Another factor biasing the competition between short-range and long-range interactions is the damping of dislocation motion: if strong enough, it can inhibit fast dislocation avalanches [112]. Consistently with this observation, plastic intermittency is suppressed in micropillars deformed at strain-rates (≥1 s −1 ) that are larger than the internal relaxation rate limited by lattice friction [113]. The damping related effects should not, however, depend on the system size L, which excludes its role in the critical to super-critical transition observed in BCC micropillars even at low T (Figure 1).…”
Section: External Versus Internal Length Scalesmentioning
confidence: 57%