2014
DOI: 10.1038/srep06699
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Probing Stochastic Nano-Scale Inelastic Events in Stressed Amorphous Metal

Abstract: One fundamental yet longstanding issue in materials science is how local inelasticity arises within an amorphous structure before yielding occurs. Although many possible scenarios were postulated or predicted by theories and simulations,however, direct experimental evidence has been lacking today due to the lack of a sensitive way to detect nano-scale inelasticity. Through the carefully designed microcompression method as coupled with the state-of-art nano-scale electric resistance measurement, we here unfold … Show more

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Cited by 13 publications
(7 citation statements)
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“…Both for white and quenched noise, this leads to randomness in the slip profile, as also reported in previous experimental studies [9,12]. In line with this initial work [1], follow-up studies successfully analyzed dislocation and slip-channel patterning [15,16], as well as dislocation clustering in cyclic plastic deformation [17,18], including the impact of stochastic nano-scale inelastic events in amorphous media [19].…”
supporting
confidence: 76%
See 1 more Smart Citation
“…Both for white and quenched noise, this leads to randomness in the slip profile, as also reported in previous experimental studies [9,12]. In line with this initial work [1], follow-up studies successfully analyzed dislocation and slip-channel patterning [15,16], as well as dislocation clustering in cyclic plastic deformation [17,18], including the impact of stochastic nano-scale inelastic events in amorphous media [19].…”
supporting
confidence: 76%
“…In order to obtain more detailed insights in to the probability distribution dynamics, we resorted to a numerical solution of Eq. (19). The results were tested independently using an Euler discretization scheme as well as a Runge-Kutta (order 4) with both numerical schemes providing identical results.…”
Section: Generalized Ornstein-uhlenbeck (Gou) Processmentioning
confidence: 99%
“…After the cessation of pop-in, the hardness immediately increases. This apparent post-pop-in “elastic” deformation could involve hidden processes of anelasticity, as recently revealed by the nano-electric-contact-resistance measurement 31 . Similar “serrated” H-h curves were also observed in other MGs (see Supplementary Figs 5 and 6 ).…”
Section: Resultsmentioning
confidence: 77%
“…In addition to the BMG composites, small MG samples subjected to tensile tests also show promising plasticity in a manner via both homogeneous and inhomogeneous flow without catastrophic failure 10 . This has stimulated intensive interest in disclosing the basic physics behind the microscopic deformation mechanisms of MGs from both theoretical and experimental aspects 11 12 13 14 15 16 17 18 19 20 . In principle, the ductility of MGs, regardless tensile or compression, is ascribed to the activation of more shear transformation zones (STZs) and more homogeneous distribution of STZs.…”
mentioning
confidence: 99%
“…Furthermore, absence of shear bands is typically regarded as a sign of homogeneous deformation occurring in metallic glasses. For instance, recent reports 17 18 41 on elastostatic compression-induced structural disordering show that homogeneous deformation of MGs can be achieved at a stress below its global yield strength due to local entropic fluctuations via cooperative atomic rearrangement. Similar experiments were also performed in a model of BMG, ZrTiCuNiBe, at a load of 80% of the yield stress, indicative of a large expansion in volume associated with shear events in the glass 42 .…”
mentioning
confidence: 99%