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Unraveling the Threshold Stress of Structural Rejuvenation of Metallic Glasses via Thermo-mechanical Creep by Gan Ding; Feng Jiang; Xuan Song; LanHong Dai; MinQiang Jiang is a Physics and Astronomy article available to read on EtoBox.

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The competition between physical aging and structural rejuvenation determines the physical and mechanical properties of glassy materials. Thus, the rejuvenation-aging boundary must be identified quantitatively. In this work, we unravel a stress boundary to distinguish rejuvenation from aging via the thermo-mechanical creep of a typical Zr-based metallic glass. The crept glasses were rejuvenated into high-enthalpy disordered states when the applied stress exceeded a threshold that was numerically close to the steady-state flow stress; otherwise, the glasses were aged. A theoretical model for glass creep was adopted to demystify the observed stress threshold of rejuvenation. The model revealed that the thermo-mechanical creep beyond the threshold stress could activate sufficient shear transformations to create a net free volume, thus leading to structural rejuvenation. Furthermore, we derived the analytical expressions for the threshold and flow stresses. Both stresses can act as the rejuvenation-aging boundary, which is well supported by experimental creep data. The present work procures a deeper understanding of the rejuvenation mechanism of glasses and provides useful implications

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Author

Gan Ding; Feng Jiang; Xuan Song; LanHong Dai; MinQiang Jiang

Publisher

Springer Science and Business Media LLC

Published

2022

Language

EN

Field

Physics and Astronomy (Physical Sciences)