Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by <i>in situ</i> tensile tests under synchrotron radiation

Stoica, M.; Das, J.; Bednarčı́k, J.; Franz, H.; Mattern, N.; Wang, W. H.; Eckert, J.

doi:10.1063/1.2952034

Cited by 71 publications

(51 citation statements)

References 45 publications

(50 reference statements)

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“…In particular they found that the strains at short distances are smaller than those at large distances. Similar results were obtained by several groups [30][31][32][33][34][35][36][37][38][39], and it is clear that such inhomogeneous response is a common feature of elasticity in metallic glasses, distinct from those of crystalline solids. There is, however, a minor problem before we discuss the implications of these results.…”

Section: Anisotropic Pdfsupporting

confidence: 75%

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Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

130

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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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Section: Anisotropic Pdfsupporting

confidence: 75%

“…A majority of researchers interpret these results in terms of distance-dependent strain [28][29][30][31][32][33][35][36][37][38][39] or chemical inhomogeneity [34]. The strain is small at short distances, and increases as r is increased.…”

Section: Interpretation Of the Resultsmentioning

confidence: 99%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

130

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“…These observations are consistent with earlier observations (by our group and others) on samples loaded in uniaxial compression 1,2 and tension. 5,7,10 To our knowledge, the data in Fig. 2 are the first to be reported for loading in pure shear.…”

Section: B Elastic Strain From G(r ψ): Isotropic Assumptionmentioning

confidence: 98%

“…[1][2][3][4][5][6][7][8][9][10] Calculating the elastic strain from shifts in the positions of peaks in the pair correlation function g(r), these groups observed that the elastic strain measured in this way increases with distance from an average atom (r), asymptotically approaching the macroscopically imposed strain. Given that elastic strain in either a crystal or an elastic continuum is expected to be independent of length scale, the question arises as to whether the observation of a length-scale dependent elastic strain in metallic glasses might be an artifact of either the experiment or the data analysis.…”

Section: Introductionmentioning

confidence: 99%

Length-scale dependence of elastic strain from scattering measurements in metallic glasses

et al. 2012

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Several recent studies have reported that the elastic strain in metallic glasses, as measured from peak shifts in the pair correlation functions of samples under load, increases with distance from an average atom, approaching the macroscopic strain at large distances. We have verified this behavior using high-energy x-ray scattering on metallic glasses loaded under uniaxial compression, uniaxial tension, and pure shear, and show that the apparent length-scale dependence of elastic strain is not an artifact of the assumption of structural isotropy in the data analysis. Molecular dynamics simulations of a binary Lennard-Jones glass loaded in uniaxial tension reproduce, qualitatively, the behavior observed in the experiments when the elastic strain is calculated from the shifts in the peaks of the pair correlation function. Under hydrostatic loading, however, the length-scale dependence of elastic strain observed in the simulations is greatly reduced. This suggests that non-affine atomic displacements, which are smaller under hydrostatic loading than under uniaxial loading, may play a key role in the length-scale dependence of elastic strain. Furthermore, no length-scale dependence is observed in simulations, for either uniaxial or hydrostatic loading, when the elastic strain is calculated from the average local deformation gradient tensor. We explain this apparent contradiction and show that the atomic displacements resulting from elastic loading are largest in the low density regions between atomic shells around an average atom. Finally, we present an analysis of length-scale dependence of elastic strain calculated from the pair correlation function for the case of homogeneous deformation, which is in good agreement with the simulations conducted under hydrostatic loading. For uniaxial loading, however, the analysis diverges from both the experimental and simulated results in the first two near-neighbor atomic shells. This suggests, in agreement with our observations from the molecular dynamics simulations, that the observed length-scale dependence of elastic strain from scattering measurements reflects the nature of the non-affine atomic displacements in the glass.

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“…The integration procedure is described in details elsewhere. 23 The patterns contain only broad maxima, without any additional sharp Bragg peaks, characteristic for fully amorphous samples. In order to ensure that the structure of the samples was homogeneous, each rod was scanned millimeter by millimeter along its axis.…”

Section: Methodsmentioning

confidence: 99%

Thermal stability and magnetic properties of partially Co-substituted (Fe71.2B24Y4.8)96Nb4 bulk metallic glasses

Stoica

Kolesár

Bednarčic

et al. 2011

Journal of Applied Physics

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The influence of partial replacement of Fe with Co in the quaternary (Fe 71.2 B 24 Y 4.8 ) 96 Nb 4 bulk metallic glasses on their structure, thermal stability and magnetic properties was studied. It was found that Co increases the thermal stability, as well as the Curie temperature, which monotonously increases as the Co content increases. The saturation magnetization shows a maximum of 1.01 μ B per magnetic atom for x = 0.1, followed by a perfectly linear decrease for higher Co contents. The extension of the supercooled liquid region may reach even 98 K and the glass transition temperatures approach the theoretical value of 2/3 of the melting temperature. Using the mean filed theory for amorphous alloys allows to calculate the exchange stiffness constant and to correlate its variation with the variation of the magnetic saturation.

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Strain distribution in Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass investigated by in situ tensile tests under synchrotron radiation

Cited by 71 publications

References 45 publications

Mechanical Properties of Metallic Glasses

Mechanical Properties of Metallic Glasses

Length-scale dependence of elastic strain from scattering measurements in metallic glasses

Thermal stability and magnetic properties of partially Co-substituted (Fe71.2B24Y4.8)96Nb4 bulk metallic glasses

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