Stress-Temperature Scaling for Steady-State Flow in Metallic Glasses

Guan, Ping; Ming-wei, Chen; Egami, T.

doi:10.1103/physrevlett.104.205701

Cited by 194 publications

(136 citation statements)

References 24 publications

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“…A similar shape has been observed for contours of equal viscosity for a model metallic glass-forming liquid [17]. Now consider the low-temperature limit T /pσ 3 → 0.…”

Section: Dimensionless Formulation Of Jamming Phase Diagrammentioning

confidence: 69%

Universal jamming phase diagram in the hard-sphere limit

2011

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We present a new formulation of the jamming phase diagram for a class of glass-forming fluids consisting of spheres interacting via finite-ranged repulsions at temperature T , packing fraction φ or pressure p, and applied shear stress Σ. We argue that the natural choice of axes for the phase diagram are the dimensionless quantities T /pσ 3 , pσ 3 / , and Σ/p, where T is the temperature, p is the pressure, Σ is the stress, σ is the sphere diameter, is the interaction energy scale, and m is the sphere mass. We demonstrate that the phase diagram is universal at low pσ 3 / ; at low pressure, observables such as the relaxation time are insensitive to details of the interaction potential and collapse onto the values for hard spheres, provided the observables are non-dimensionalized by the pressure. We determine the shape of the jamming surface in the jamming phase diagram, organize previous results in relation to the jamming phase diagram, and discuss the significance of various limits.

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“…A similar shape has been observed for contours of equal viscosity for a model metallic glass-forming liquid [17]. Now consider the low-temperature limit T /pσ 3 → 0.…”

Section: Dimensionless Formulation Of Jamming Phase Diagrammentioning

confidence: 69%

Universal jamming phase diagram in the hard-sphere limit

2011

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“…These few easy flowing spots do not change the brittle nature of MGs. When the temperature continuous to exceed, adjacent weak-bonded regions around flow unit regions are also gradually transformed into liquid state, as the applied strain lowers the energy barrier between adjacent megabasins in energy landscape 51,57,58 and increase the fraction of the flow units as illustrated in Fig. 5.…”

Section: Disscussionmentioning

confidence: 99%

Evolution of hidden localized flow during glass-to-liquid transition in metallic glass

et al. 2014

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For glasses, the structural origin of their flow phenomena, such as elastic and plastic deformations especially the microscopic hidden flow before yield and glass-to-liquid transition (GLT), is unclear yet due to the lack of structural information. Here we investigate the evolution of the microscopic localized flow during GLT in a prototypical metallic glass combining with dynamical mechanical relaxations, temperature-dependent tensile experiments and stress relaxation spectra. We show that the unstable and high mobility nano-scale liquid-like regions acting as flow units persist in the glass and can be activated by either temperature or external stress. The activation of such flow units is initially reversible and correlated with b-relaxation. As the proportion of the flow units reaches a critical percolation value, a mechanical brittle-to-ductile transition or macroscopic GLT happens. A comprehensive picture on the hidden flow as well as its correlation with deformation maps and relaxation spectrum is proposed.

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“…The system is deformed with a constant strain rate, not by a constant stress. In such a case, the yield stress, σ Y , the stress needed to start plastic deformation, is much higher than the flow stress, σ f ; the stress necessary to maintain the flow at low temperatures ( Figure 12 [60]). This is because up to σ Y deformation is basically elastic, and the structure, defined by the topology of atomic connectivity, remains unchanged.…”

Section: Feedback Effect Of Structural Parametermentioning

confidence: 99%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

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Metallic glasses are known for their outstanding mechanical strength. However, the microscopic mechanism of failure in metallic glasses is not well-understood. In this article we discuss elastic, anelastic and plastic behaviors of metallic glasses from the atomistic point of view, based upon recent results by simulations and experiments. Strong structural disorder affects all properties of metallic glasses, but the effects are more profound and intricate for the mechanical properties. In particular we suggest that mechanical failure is an intrinsic behavior of metallic glasses, a consequence of stress-induced glass transition, unlike crystalline solids which fail through the motion of extrinsic lattice defects such as dislocations.

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Stress-Temperature Scaling for Steady-State Flow in Metallic Glasses

Cited by 194 publications

References 24 publications

Universal jamming phase diagram in the hard-sphere limit

Universal jamming phase diagram in the hard-sphere limit

Evolution of hidden localized flow during glass-to-liquid transition in metallic glass

Mechanical Properties of Metallic Glasses

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