Microscopic description of flow defects and relaxation in metallic glasses

Atzmon, Michael; Ju, JongDoo

doi:10.1103/physreve.90.042313

Cited by 28 publications

(30 citation statements)

References 31 publications

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“…at the final states, denoted as "rlx" in the legend of Fig.2.b), the average size increases to around 17, which is consistent with reported STZs sizes (from 10 to 30 atoms) measured in a number of experiments [37][38][39][40][41] and simulations [4,8,35,42,43]. It is worth noting that, the size distributions of SYS-I and SYS-II overlap well at relatively small sizes (less than 30 atoms), suggesting a system-independent deformation mechanism in this regime.…”

supporting

confidence: 75%

Crossover from Localized to Cascade Relaxations in Metallic Glasses

2015

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supporting

confidence: 75%

Crossover from Localized to Cascade Relaxations in Metallic Glasses

2015

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“…For example, materials are typically deemed reversible in the regime where the stress-strain curve is linear, and irreversible in the regime where plastic flow occurs [48]. Reversibility has been studied experimentally using enthalpy [18] and strain recovery [19], elastostatic compression [16], nanoindentation [10], and quality factor measurements [49]. In simulations, reversibility has been studied using cyclic shear of model glasses [17,[50][51][52][53][54].…”

Section: Resultsmentioning

confidence: 99%

“…Amorphous solids, including metallic, polymeric, and colloidal glasses, possess complex mechanical response to applied deformations, such as plastic flow [1][2][3][4], strain localization [5][6][7][8][9], creep flow [7,10,11], and fracture [12][13][14]. In crystalline materials, topological defects reflecting the symmetry of the crystalline phase govern response to deformation.…”

Section: Introductionmentioning

confidence: 99%

Effects of cooling rate on particle rearrangement statistics: Rapidly cooled glasses are more ductile and less reversible

et al. 2017

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Amorphous solids, such as metallic, polymeric, and colloidal glasses, display complex spatiotemporal response to applied deformations. In contrast to crystalline solids, during loading, amorphous solids exhibit a smooth crossover from elastic response to plastic flow. In this study, we investigate the mechanical response of binary Lennard-Jones glasses to athermal, quasistatic pure shear as a function of the cooling rate used to prepare them. We find several key results concerning the connection between strain-induced particle rearrangements and mechanical response. We show that the energy loss per strain dU loss /dγ caused by particle rearrangements for more rapidly cooled glasses is larger than that for slowly cooled glasses. We also find that the cumulative energy loss U loss can be used to predict the ductility of glasses even in the putative linear regime of stress versus strain. U loss increases (and the ratio of shear to bulk moduli decreases) with increasing cooling rate, indicating enhanced ductility. In addition, we characterized the degree of reversibility of particle motion during a single shear cycle. We find that irreversible particle motion occurs even in the linear regime of stress versus strain. However, slowly cooled glasses, which undergo smaller rearrangements, are more reversible during a single shear cycle than rapidly cooled glasses. Thus, we show that more ductile glasses are also less reversible.

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“…Since a finite number of STZ sizes affect the anelastic relaxation at a given temperature, we approximate for simplicity and without loss of generality the qualitative shape of the spectrum obtained in Refs. [2,7] with five STZ sizes (N = 5 in Fig. 1).…”

Section: Resultsmentioning

confidence: 99%