Affordable Access

Microscopic Calculation of Flow Stress in Cu-Mg Metallic Glass

Authors
  • Bailey, Nicholas P.
  • Schiøtz, Jakob
  • Jacobsen, Karsten W.
Type
Preprint
Publication Date
Jun 14, 2004
Submission Date
Jun 14, 2004
Identifiers
arXiv ID: cond-mat/0406308
Source
arXiv
License
Unknown
External links

Abstract

We have carried out shear-deformation simulations on amorphous Mg-Cu systems at zero temperature and pressure, containing 2048-131072 atoms. At the largest size a smooth stress-strain curve is obtained with a well-defined flow stress. In the smallest system there are severe discontinuities in the stress-strain curve caused by localized plastic events. We show that the events can be characterized by a slip volume and a critical stress and we determine the distribution of these quantities from the ensemble of all events occurring in the small system. The distribution of critical stresses at which the enthalpy barriers for the individual events vanish is spread between 200 MPa and 500 MPa with a mean of 316 MPa, close to the flow stress observed in the largest system.

Report this publication

Statistics

Seen <100 times