Elastic constants, hardness and their implications to flow properties of metallic glasses

Chen, H.S.; Krause, J. T.; Coleman, E.

doi:10.1016/0022-3093(75)90018-6

Cited by 217 publications

(80 citation statements)

References 37 publications

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“…A low value of m=B, equally expressed as a high value of Poisson's ratio n, favours plasticity. The link between n and plasticity was noted for metallic glasses by Chen et al [13], and was explored quantitatively by Lewandowski et al [14], who found a sharp transition: Metallic glasses show significant toughness only when n exceeds a critical value of 0.31-0.32. This has excited interest in tuning compositions to increase n, and in this way many tough bulk MGs have been realized [15][16][17].…”

Section: Introductionmentioning

confidence: 92%

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Wei

Lei

Huo

et al. 2013

Materials Science and Engineering: A

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a b s t r a c tWe develop a quantitative analysis of how the plastic deformation in a metallic glass is more uniform if its Poisson ratio n is higher. The plasticity of metallic glasses under ambient conditions is mediated by shear localized in thin bands, and can be characterized by experiments on the bending of thin plates. We extend the analysis by Conner et al. (Conner et al., J. Appl. Phys. 94 (2003), 904-911) of bands in bent plates to include the micromechanics of individual shear bands. Expressions are derived for the shearband spacing and the offset on each band. Both these quantities are predicted to decrease as n is increased. The predictions are tested against measurements on metallic glasses with a wide range of n.Good agreement is found, supporting the new model for the shear-band spacing, and pointing the way towards more diffuse deformation, and consequently improved plasticity and toughness, of metallic glasses as n increases toward the limiting value of 0.5. Crown

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Section: Introductionmentioning

confidence: 92%

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Wei

Lei

Huo

et al. 2013

Materials Science and Engineering: A

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“…Early experimental work by Chen 13 indicated that changes to the elastic constants (e.g., Poisson's ratio) of amorphous materials could control the magnitude of hardness and extent of deformation possible. More recent work by Johnson et al 14 has suggested that high compressive ductility is similarly facilitated in metallic glasses with high Poisson's ratio.…”

Section: Alloy Synthesis and Mechanical Testingmentioning

confidence: 99%

Introduction

Eckert

Kecskes

et al. 2007

J. Mater. Res.

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“…The CSM is based on the concept of inherent states (IS) and potential energy landscapes (PEL) developed by Stillinger et al [8,9], Wales et al [10,11], and Milandro and Lacks [12]. Table I shows measured density, ambient T elastic constants Y, G, B, (Poisson's ratio), yield strength in compression, y , elastic strain limit ( Y =Y), and glass transition temperature, T g , for 30 metallic glasses [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Note that Y =Y varies over the range 0:014 < " Y < 0:022.…”

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confidence: 99%

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

2005

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Room temperature (T R ) elastic constants and compressive yield strengths of 30 metallic glasses reveal an average shear limit C 0:0267 0:0020, where Y C G is the maximum resolved shear stress at yielding, and G the shear modulus. The C values for individual glasses are correlated with t T R =T g , and C for a single glass follows the same correlation (vs t T=T g For a dislocation free crystal, Frenkel [1] calculated the theoretical shear strength by assuming cooperative shearing obtaining Y G=5. The yield strength of metallic glasses is thought to be determined by the cooperative shear motion of atomic clusters termed shear transformation zones (STZ's) [2 -5]. Compressive strengths of Y 0:02Y are observed with a weak dependence on normal stress or pressure [6,7]. Here, we report elastic constants and compressive yield stresses for 30 metallic glasses. Yielding at T R can be described by a critical shear strain C 0:0267 0:0020; a better description of C includes a dependence on the dimensionless temperature t T=T g . A cooperative shear model (CSM) is introduced that predicts a temperature dependent C (or C

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Elastic constants, hardness and their implications to flow properties of metallic glasses

Cited by 217 publications

References 37 publications

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Introduction

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

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