Size-dependent failure mechanisms in ZrNi thin metallic glass films

Matteo Ghidelli (1, 2) , Sébastien Gravier (2) , Jean-Jacques Blandin (2) , Jean-Pierre Raskin (1) , Frédéric Lani , Thomas Pardoen (1)

1 ULB - Université libre de Bruxelles
2 SIMaP - Science et Ingénierie des Matériaux et Procédés

The fracture toughness of submicron Zr65Ni35 sputter-deposited films is thickness dependent. The failure mechanism involves corrugations for the thickest films and a transition-at 500 nm thickness-to a perfectly flat fracture surface. Both mechanisms are brittle-type, even though the elastic and plastic properties are independent of thickness and similar to the expected ductile bulk response. Finite-element simulations unravel the origin of the size effect and the transition of failure mode from the constraint on plastic dissipation.

Domaines: Matériaux

Matteo Ghidelli, Sébastien Gravier, Jean-Jacques Blandin, Jean-Pierre Raskin, Frédéric Lani, et al.. Size-dependent failure mechanisms in ZrNi thin metallic glass films. Scripta Materialia, 2014, 89, pp.9-12. ⟨10.1016/j.scriptamat.2014.06.011⟩. ⟨hal-01120073⟩