Abstract
We show suppressed relaxation behavior and an apparent hardening effect under repeated loading in metallic glasses through cyclically tensile stress relaxation experiments. The effects are attributed to the gradual exhaustion of deformation units via activation energy spectra analysis. We find the suppression is partly alleviated and rapidly saturates with increasing the time interval between the cyclic loadings, reflecting the observed phenomena are associated with the un-recovered activated deformation units. These results may shine light on the long-standing issues such as the fatigue damage, cyclic hardening, and the deformation mechanism of metallic glasses.
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