☆ 4.7 Article

Stress-induced gradient rejuvenation framework and memory effect in a metallic glass

SCRIPTA MATERIALIA (2022)

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Journal

SCRIPTA MATERIALIA
Volume 213, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114636

Keywords

Bulk metallic glass; Elastostatic loading; Gradient rejuvenation; Memory effect

Categories

Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

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In this study, a nonuniform structure was created in a Zr-based metallic glass using lateral elastostatic preloading, which effectively suppressed shear band propagation and improved the relationship between strength and plasticity. Additionally, a stress-induced memory effect was observed during elastostatic loading. These findings have important implications for the rejuvenation and mechanical property improvement of metallic glasses.
Rejuvenation of metallic glasses (MGs) brings them in higher-energy states, which improves their mechanical properties. However, how to rejuvenate MGs through a fast and simple approach is still a challenge. In the present work, a nonuniform structure consisting of a center-relaxation region surrounded by an edge-gradient rejuvenation framework was created in a Zr-based bulk metallic glass (BMG) by lateral elastostatic preloading. Such a nonuniform structure greatly suppresses the rapid propagation of shear bands and has the potential to overcome the inverted relationship between strength and plasticity. More interestingly, we found a stress induced memory effect, viz., the recovery of relaxation enthalpy during elastostatic loading, which is quite different from the thermal-induced memory effect in previous works. This indicates a certain degree of equivalence between stress and temperature in the dynamics of MGs.

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