DYMAT 2009
Volume 2, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 985 - 991
Section Micro-Structural Effects
Published online 15 September 2009
DYMAT 2009 (2009) 985-991
DOI: 10.1051/dymat/2009138

Effect of the dynamic loading rate on the failure of bulk metallic glasses

H. Couque1, Y. Champion2 and S. Nowak2

1  Nexter Munitions, 7 route de Guerry, 18023 Bourges, France
2  ICMPE, Université Paris 12 – CNRS 2-8 rue Henri Dunant, 94320 Thiais Cedex, France

Published online: 15 September 2009

The absence of structural ordering in bulk metallic glasses (BMGs) leads to plastic deformation controlled by shear bands initiation, propagation, and interactions which differ most likely when quasi-static or dynamic loads are applied. Under quasi-static loading and high hydrostatic stress, the shear band initiation and propagation process is stable which can result in large plastic deformation in excess of 0.50. Under dynamic loading conditions, BMGs are brittle. The objective of the present study was to examine the influence of the dynamic loading rate on the failure mechanisms of a Zr57Ti5Cu20Ni8Al10 BMG. Dynamic compression tests were conducted with a direct impact compression apparatus over a wide range of dynamic strain rates from 570 to 7760 s−1. The decrease of the dynamic failure stress with the increase of strain rate was interpreted through the analysis of observed failure mechanisms.

© EDP Sciences 2009