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A Universal Criterion for Amortization in Metallic Systems

Published online by Cambridge University Press:  25 February 2011

D. T. Kulp,
T. Egami,
D. E. Luzzi and
V. Vitek
D. T. Kulp
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104.
T. Egami
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104.
D. E. Luzzi
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104.
V. Vitek
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104.
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Abstract

Recent computer simulation studies of electron-bombarded metallic alloys have concentrated on finding a criterion for amorphization. It has been suggested that the thermodynamic properties of volume and total energy can be used as a gauge for defect induced amorphization. Our simulation results indicate that these properties can not be used due to their dependence on processing history. We propose that the distribution of the atomic level shear stresses can be used as this amorphization criterion. Using Finnis-Sinclair type many-body potentials and Lennard-Jones pair potentials, molecular dynamics (MD) simulations on several model systems have been performed. By quantifying the analysis using the average shear stress normalized, by the average shear modulus of the glass, we will present evidence that the crystal becomes amorphous at the defect concentration where the normalized average shear stress reaches a critical value, which is equivalent to the state obtained through quenching from the liquid.

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