Local elastic properties of a metallic glass

Wagner, Hannes; Bedorf, Dennis; Küchemann, Stefan; Schwabe, Moritz; Zhang, Bo; Arnold, W.; Samwer, K.

doi:10.1038/nmat3024

Cited by 391 publications

(268 citation statements)

References 22 publications

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“…1). However, in our case, due to possible polishing defects and the existence of native surface oxides, the distribution width is larger than that found by Wagner et al 24 . Interestingly, thermal cycling increases the average apparent Young's modulus as well as its surface variation width (Fig.…”

Section: Resultscontrasting

confidence: 85%

“…However, the results of the present work show that these conclusions might have been premature. It was discovered by atomic force resonant microscopy experiments that the statistical variation in Young's modulus on the surface of metallic glasses is much wider than that known for crystalline materials 24 . This effect is caused by the existence of soft or loosely packed and hard or densely packed zones in metallic glasses.…”

Section: Resultsmentioning

confidence: 96%

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On cryothermal cycling as a method for inducing structural changes in metallic glasses

et al. 2018

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The influence of cryothermal treatment on the mechanical properties of metallic glasses with different compositions was investigated in the present work. It was found that cryothermal cycling can induce rejuvenation as well as relaxation of the metallic glasses. The local apparent Young's modulus and its spatial distribution width on the surface of the metallic glass increase after cryothermal cycling, while in the bulk the effect depends on the glass composition. It appeared that this increase is temporary and disappears after a period of room temperature aging. This effect is connected with a large distribution of relaxation times in the metallic glasses due to their heterogeneous structure and the formation of complex native oxides on the outer surfaces of the glasses. Our findings reveal that a cryothermal cycling treatment can improve or degrade the plasticity of a metallic glass, and the atomic bond structure appears to be very important for the outcome of the treatment.

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Section: Resultscontrasting

confidence: 85%

Section: Resultsmentioning

confidence: 96%

On cryothermal cycling as a method for inducing structural changes in metallic glasses

et al. 2018

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“…1(e). This heterogeneity is also in qualitative agreement with computer simulations of Lennard-Jones glasses [22] and measurements on metallic glasses by atomic force microscopy [23].…”

Section: A Structure and Dynamics Of The Quiescent Glasssupporting

confidence: 84%

Visualizing the strain evolution during the indentation of colloidal glasses

et al. 2014

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We use an analog of nanoindentation on a colloidal glass to elucidate the incipient plastic deformation of glasses. By tracking the motion of the individual particles in three dimensions, we visualize the strain field and glass structure during the emerging deformation. At the onset of flow, we observe a power-law distribution of strain indicating strongly correlated deformation, and reflecting a critical state of the glass. At later stages, the strain acquires a Gaussian distribution, indicating that plastic events become uncorrelated. Investigation of the glass structure using both static and dynamic measures shows a weak correlation between the structure and the emerging strain distribution. These results indicate that the onset of plasticity is governed by strong power-law correlations of strain, weakly biased by the heterogeneous glass structure.

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“…From Fig. 3a,b, the increase of temperature leads to an increment of Ds, indicating that more fractions of atoms in the MG undergo inelastic deformation and are transformed into liquid-like state 50,51 . Therefore, we model the MG into two parts: liquid-like zones and elastic matrix.…”

Section: Disscussionmentioning

confidence: 92%

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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Local elastic properties of a metallic glass

Cited by 391 publications

References 22 publications

On cryothermal cycling as a method for inducing structural changes in metallic glasses

On cryothermal cycling as a method for inducing structural changes in metallic glasses

Visualizing the strain evolution during the indentation of colloidal glasses

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

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