Activation Volume of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>57</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mi>o</mml:mi></mml:math>Diffusion in Amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Co</mml:mi></mml:mrow><mml:mrow><mml:mn>81</mml:mn></mml:mrow></

Klugkist, P.; Rätzke, Klaus; Rehders, Stefan; Troche, P.; Faupel, Franz

doi:10.1103/physrevlett.80.3288

Cited by 47 publications

(41 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As Cohen and Turnbull already noted [68] the pressure dependence of diffusivity in metallic liquids is much weaker than predicted by the free-volume theory [101,102]. An argument in defense of the free-volume theory for this pressure effect is that the pressure applied externally to the glass does not change the amount of free-volume in the glass, because the glass is already frozen and does not reach the equilibrium state under pressure.…”

Section: Free-volume Mechanismmentioning

confidence: 89%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

134

View full text Add to dashboard Cite

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.

show abstract

Section: Free-volume Mechanismmentioning

confidence: 89%

Mechanical Properties of Metallic Glasses

Egami

Iwashita

Dmowski

2013

Metals

134

View full text Add to dashboard Cite

show abstract

“…It may not be necessary to consider the atomic size void at all, but it may suffice just to assume that the free volume in metal is small and amounts only to 10 pct of the atomic volume. Indeed the pressure dependence [15,16] and the isotope effect [17] of diffusivity are much smaller than expected for an atomic size free volume. More recently, it was found by computer simulation that atomic diffusion takes place through collective motions (chain reaction) of small local displacements rather than a big step involving free volume.…”

Section: Free-volume Theorymentioning

confidence: 90%

Statistical Mechanics of Metallic Glasses and Liquids

Egami

Levashov

Morris

et al. 2010

Metall Mater Trans A

View full text Add to dashboard Cite

It is difficult to formulate the statistical mechanical theory of liquids and glasses, because phonons, which are the basis for the statistical mechanics of lattice dynamics in crystals, are strongly scattered and have a very short lifetime in liquids and glasses. Instead computer simulation and the ''free-volume'' theory are most frequently used in explaining experimental results on metallic glasses. However, both of them suffer from serious problems, as discussed in this article. We propose an alternative approach based upon the dynamics of the atomic level stresses. We review recent progress with this approach and show that it is possible to calculate thermodynamic quantities, including the glass transition temperature and the kinetics of structural relaxation, by this approach.

show abstract

“…In metallic materials, because of the harmonic nature of the interatomic potential, atoms can squeeze through tight space without free-volume when sufficient shear stress is applied. It was demonstrated that diffusivity in metallic liquids is surprisingly insensitive to pressure, whereas in the free-volume theory diffusivity is expected to be suppressed by pressure [36,37]. Lewandowski have shown that the mechanical strength of metallic glasses is almost the same in tension and compression, and thus nearly independent of pressure [38], indicating that pressure has only minor effects.…”

Section: Shear-transformation-zone Modelingmentioning

confidence: 96%

On the source of plastic flow in metallic glasses: Concepts and models

et al. 2015

View full text Add to dashboard Cite

a b s t r a c tWe briefly review the state-of-the-art study on plastic flow in metallic glasses. Especially, we survey the features and behaviors, percolation, and response of the basic deformation units to the activation of stress and temperature, and various models and notions on microscopic flow in metallic glasses. The discussion, comments and perspective on possible unified notation, terminologies and models on plastic flow in metallic glasses are presented. The purpose is to reach a consensus within the community with a hope to eventually unify the notations and models on the deformations in metallic glasses.

show abstract

Activation Volume ofC57oDiffusion in AmorphousCo81

Cited by 47 publications

References 23 publications

Mechanical Properties of Metallic Glasses

Mechanical Properties of Metallic Glasses

Statistical Mechanics of Metallic Glasses and Liquids

On the source of plastic flow in metallic glasses: Concepts and models

Contact Info

Product

Resources

About