Molecular dynamics simulation of cyclic indentation in Fe-based amorphous alloy

HR Lashgari and C Tang and D Chu and S Li, COMPUTATIONAL MATERIALS SCIENCE, 143, 473-479 (2018).

DOI: 10.1016/j.commatsci.2017.11.045

In our previous study, we showed that the cyclic nanoindentation of Fe80.75Si8B11.25 (at.%) amorphous and stress-relaxed alloys results in the so-called strain-hardening behaviour leading to yielding at a higher load upon unloading-reloading. In the current study, the experimental results from our previous work are combined with molecular dynamics (MD) simulation to understand the reason for the resulting cyclic hardening. It is concluded that among atomic volume, coordination number and the fraction of pentagon facets (five-fold symmetry), five-fold symmetry being related to the shearing resistance is someway larger during unloading-reloading (multi-step nanoindentation) which seems to be responsible for the resulting strain-hardening behaviour. (C) 2017 Elsevier B.V. All rights reserved.

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