Introduction

Li, Mo; Eckert, J.; Kecskes, Laszlo J.; Lewandowski, John J.

doi:10.1557/jmr.2007.0069

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…More recent work [16][17][18] has explored the effects of systematic changes in Poisson ratio (e.g., via changes in chemistry or annealing treatment) on ductility [16][17][18][19][20] and toughness, [16] with significant increases in plasticity accompanying higher Poisson ratios, as reviewed elsewhere. [21] Compression tests of many BMGs, conducted at sufficiently low strain rates near the T g , have reported ''homogeneous'' flow, also in agreement with SpaepenÕs free volume theory. However, the cross-sectional area was not monitored in these studies, [4,[22][23][24][25][26] and deformation was assumed to be uniform and thus homogeneous.…”

Section: Introductionsupporting

confidence: 63%

Effects of Test Temperature and Loading Conditions on the Tensile Properties of a Zr-Based Bulk Metallic Glass

Vormelker

Vatamanu

Kecskes

et al. 2007

Metall Mater Trans A

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The effects of changes in test temperature (20°C, 260°C, 330°C, and 380°C), strain rate (10 -5 to 10 -1 s -1 ), and loading conditions (displacement control vs loading-rate control) on the tensile behavior of Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 (LiquidMetal 1 (LM1)), a bulk metallic glass (BMG), have been determined. Significant effects of the test temperature, strain rate, and loading condition were observed on the strength, ductility/elongation, and mechanisms of failure (shear, ductile rupture, etc.). This material exhibited extensive elongation (i.e., >100 pct) prior to failure when tested near the glass transition temperature (T g % 375°C) at sufficiently low strain rates, while higher strain rates or lower test temperatures produced shear fracture at low elongation. The flow and fracture behavior was also significantly affected by the loading condition (i.e., displacement vs loading-rate control). The effective strain rate necessary to cause failure in shear without significant global flow was several orders of magnitude lower in loadingrate control than in displacement control. Samples exhibiting high elongation tested in displacement control gently and convexly drew to a near point (i.e., ductile rupture). Samples tested at the same temperature exhibiting high elongation in loading-rate control rapidly and concavely necked, followed by drawing to a constant diameter ''wire'' (i.e., ductile drawing), eventually failing by nearly pure ductile rupture. All samples that displayed significant elongation did so inhomogeneously, and were characterized by non-Newtonian global flow.

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Section: Introductionsupporting

confidence: 63%

Effects of Test Temperature and Loading Conditions on the Tensile Properties of a Zr-Based Bulk Metallic Glass

Vormelker

Vatamanu

Kecskes

et al. 2007

Metall Mater Trans A

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“…It is known that usually bulk MGs have poor ductility. 25,26 Therefore, an important problem is the enhancement of mechanical properties through understanding the correlation between chemical composition, atomic structure, and macroscopic physical characteristics. In the case of ordinary crystalline alloys, materials with better ductility frequently have higher Poisson's ratio, , or, equally, lower shear ͑G͒ to bulk ͑K͒ modulus ratio.…”

Section: B Elastic Propertiesmentioning

confidence: 99%

First-principles simulation of the elastic properties of multicomponent amorphous steels

Kazimirov

2009

Phys. Rev. B

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The local atomic structure and elastic properties of two series of multicomponent amorphous steels-with and without phosphorus addition-have been investigated by ab initio molecular dynamics. A comparison of neutron pair-distribution functions allowed the difference in local atomic organization for these two series to be explained in terms of the atomic size effect. The conclusions drawn on the basis of "empirical" consideration were confirmed by the results of first-principles simulations. The structural models obtained in the course of ab initio molecular-dynamics calculations were used for the simulation of the elastic properties and the results of the modeling revealed a close agreement with the experiment. This allowed us to elucidate a role of particular chemical elements in improving the ductility of particular compositions.

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“…Glasses feature remarkable mechanical responses which challenge modeling, among which we note the very high elastic limit [29,43] and the localization of plastic deformation [35,68,74]. Beyond the static mechanical response, let us also mention the anomalous density of low frequency vibrational states giving rise to high heat capacity [24], low heat conductivity [24], low vibrational mean free path for the high frequency vibrational modes [28,61,69].…”

Section: Introductionmentioning

confidence: 98%

Atomistic response of a model silica glass under shear and pressure

et al. 2012

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The Mechanical Response of a Model Silica Glass is studied extensively at the submicrometer scale, with the help of atomistic simulations. The analysis of the response to a hydrostatic compression is compared to recent experimental results. The irreversible behaviour and the variation of intertetrahedral angles is recovered. It is shown that the atomistic response is homogeneous upon compression, in opposition with the localization along shear bands occuring during shear deformation with constant volume. Moreover, the Bulk Modulus anomaly is interpreted as due to a succession of such homogeneous but irreversible atomic rearrangements.

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Introduction

Cited by 12 publications

References 15 publications

Effects of Test Temperature and Loading Conditions on the Tensile Properties of a Zr-Based Bulk Metallic Glass

Effects of Test Temperature and Loading Conditions on the Tensile Properties of a Zr-Based Bulk Metallic Glass

First-principles simulation of the elastic properties of multicomponent amorphous steels

Atomistic response of a model silica glass under shear and pressure

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