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Abstract
The principal findings of a comprehensive computational simulation of plastic flow in amorphous Si – presented elsewhere in detail – are summarized. The unit plastic events have been identified to consist of discrete shear transformations triggered at characteristic thresholds of stress that result in transformation shear strains of about 0.015. Based on these findings, a kinetic model of plastic flow is proposed that provides for the temperature dependence of the plastic flow resistance and explains the evolution of a unique flow state starting from different amorphous structures. It is proposed that these findings should be broadly applicable to other strongly bonded glassy covalent compounds.
§Dedicated to F. R. N. Nabarro on the occasion of his 90th birthday, in recognition of six and a half decades of insightful contributions to materials science.
Acknowledgements
The simulations leading to the present overview were supported by an NSF graduate program and a DURINT program funded at MIT through the ONR under grant N00014-01-1-0808. We are grateful to Professor S. Suresh, the principal DURINT program director, for his support. We also acknowledge a close interaction with Professor S. Veprek of the Technical University of Munich, Germany, and fruitful discussions with Professor D. M. Parks.
Notes
§Dedicated to F. R. N. Nabarro on the occasion of his 90th birthday, in recognition of six and a half decades of insightful contributions to materials science.
