Journal
PHILOSOPHICAL MAGAZINE
Volume 90, Issue 10, Pages 1373-1390Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786430903352664
Keywords
metallic glass; cyclic deformation; fatigue; nanoindentation
Categories
Funding
- Office of Naval Research [N00014-08-10312]
- National Defense Science and Engineering Graduate (NDSEG)
- Army Research Office (ARO)
- King Fahd University of Petroleum & Minerals (KFUPM)
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A combined program of experiments and simulations is used to study the problem of cyclic indentation loading on metallic glasses. The experiments use a spherical nanoindenter tip to study shear band formation in three glasses (two based on Pd and one on Fe), after subjecting the glass to cycles of load in the nominal elastic range. In all three glasses, such elastic cycles lead to significant increases in the load required to subsequently trigger the first shear band. This cyclic hardening occurs progressively over several cycles, but eventually saturates. The effect requires cycles of sufficient amplitude and is not induced by sustained loading alone. The simulations employed a new shear transformation zone (STZ) dynamics code to reveal the local STZ operations that occur beneath an indenter during cycling. These results reveal a plausible mechanism for the observed cyclic hardening: local regions of confined microplasticity can develop progressively over several cycles, without being detectable in the global load-displacement response. It is inferred that significant structural change must attend such microplasticity, leading to hardening of the glass.
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