Fracture Toughness of Metallic Glasses: Annealing-Induced Embrittlement

Rycroft, Chris H.; Bouchbinder, Eran

doi:10.1103/physrevlett.109.194301

Cited by 103 publications

(105 citation statements)

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“…2, more rapidly cooled glasses suffer larger energy loss during shear. We propose that enhanced energy loss through particle rearrangements at small strains can prevent catastrophic brittle failure, by preventing stress accumulation and localization [29,31,41,44,45]. This suggests that more rapidly cooled glasses are more ductile than slowly cooled glasses [14].…”

Section: Resultsmentioning

confidence: 99%

“…The cooling rate determines the fictive temperature, which defines the average energy of the glass in the potential energy landscape [27,28]. The fictive temperature significantly affects mechanical properties, such as ductility [14,29,30], shear band formation [31], and stress versus strain [2,32]. Prior work has characterized the disappearance of minima in the energy landscape and resulting particle rearrangements versus applied strain [26,33,34].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…(4.4) and (4.5) to write the left-hand side as 20) which defines the effective heat capacity V c eff = χ ∂S 1 /∂χ. Next, make a similar expansion of the righthand side of Eq.…”

Section: Nonequilibrium Equations Of Motionmentioning

confidence: 99%

Thermodynamic theory of dislocation-enabled plasticity

Langer

2017

Phys. Rev. E

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The thermodynamic theory of dislocation-enabled plasticity is based on two unconventional hypotheses. The first of these is that a system of dislocations, driven by external forces and irreversibly exchanging heat with its environment, must be characterized by a thermodynamically defined effective temperature that is not the same as the ordinary temperature. The second hypothesis is that the overwhelmingly dominant mechanism controlling plastic deformation is thermally activated depinning of entangled pairs of dislocations. This paper consists of a systematic reformulation of this theory followed by examples of its use in analyses of experimentally observed phenomena including strain hardening, grain-size (Hall-Petch) effects, yielding transitions, and adiabatic shear banding.

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“…At the tip of this crack, the stress applied at the boundaries is highly focused into a small region, often termed the "failure process zone." It is in this small region that the rupturing and breaking of bonds actually occurs; in this zone, which generally depends on material toughness (1,2), dissipation and nonlinearities dominate the dynamics (3,4). Outside of this zone, linear elasticity characterizes the medium's response.…”

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confidence: 99%

The role of rigidity in controlling material failure

Driscoll

Chen

Beuman

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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We investigate how material rigidity acts as a key control parameter for the failure of solids under stress. In both experiments and simulations, we demonstrate that material failure can be continuously tuned by varying the underlying rigidity of the material while holding the amount of disorder constant. As the rigidity transition is approached, failure due to the application of uniaxial stress evolves from brittle cracking to system-spanning diffuse breaking. This evolution in failure behavior can be parameterized by the width of the crack. As a system becomes more and more floppy, this crack width increases until it saturates at the system size. Thus, the spatial extent of the failure zone can be used as a direct probe for material rigidity.failure | metamaterials | jamming | cracks | glasses

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Fracture Toughness of Metallic Glasses: Annealing-Induced Embrittlement

Cited by 103 publications

References 50 publications

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

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

Thermodynamic theory of dislocation-enabled plasticity

The role of rigidity in controlling material failure

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