Atomistic simulations of Mg-Cu metallic glasses: Mechanical properties

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Abstract

The atomistic mechanisms of plastic deformation in amorphous metals are far from being understood. We have derived potential parameters for molecular dynamics simulations of Mg-Cu amorphous alloys using the Effective Medium Theory. We have simulated the formation of alloys by cooling from the melt, and have used these glassy configurations to carry out simulations of plastic deformation. These involved different compositions, temperatures (including zero), and types of deformation (uniaxial strain/pure shear), and yielded stress-strain curves and values of flow stress. Separate simulations were carried out to study specific features in the stress-strain curves associated with transitions involving internal rearrangements of atoms. Energy barriers were calculated as a function of stress, as was the plastic strain associated with events. The latter leads to a characteristic volume of an event which seems to correspond with the derivative of the barrier with respect to stress. (C) 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalMaterials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing
Volume387-389
Pages (from-to)996-1000
ISSN0921-5093
DOIs
Publication statusPublished - 15 Dec 2004
Event13th International Conference on the Strength of Materials - Budapest, Hungary
Duration: 25 Aug 200330 Aug 2003
Conference number: 13

Conference

Conference13th International Conference on the Strength of Materials
Number13
CountryHungary
CityBudapest
Period25/08/200330/08/2003

Keywords

  • metallic glass
  • Mg-Cu
  • plastic deformation
  • atomistic simulation
  • localized events
  • energy barriers

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