Significant rejuvenation of a deformed metallic glass contributed by shear band affected zones during cryogenic cycling

摘要

Cryogenic thermal cycling (CTC) treatment is a simple and effective technique to rejuvenate metallic glasses (MGs). However, how the structural heterogeneities of MGs are influenced by CTC is still a problem. In this study, the effects of CTC on mechanical properties and thermal responses of as-cast and as-deformed Zr-based bulk metallic glasses (BMGs) were investigated. Due to the existence of shear bands and their affected zones, the deformed BMG presents greater sensitivity to the CTC treatment, and its softening effect first increases and then saturates with the number of cycles.