Microstructural mechanisms of tuning the deformation behaviors in annealed metallic glasses

MF Li and DP Wang and B Malomo and L Yang, JOURNAL OF ALLOYS AND COMPOUNDS, 876, 160029 (2021).

DOI: 10.1016/j.jallcom.2021.160029

An insightful investigation on the deformation behavior of annealed metallic glass (MG) has been conducted in this study to uncover the essential mechanisms of deformation in annealed MGs that remain fully amorphous, a subject that is complex and challenging to the MG scientific community. By coupling synchrotron radiation-based experiments with a series of molecular dynamics simulations and calculations, representative microstructure models of deformed MGs in as-prepared and annealed conditions were successfully probed. It was discovered that higher maximum strength and poor plasticity of the annealed MGs are manifestations of the causative effect of higher temperatures from the annealing treatment. The deformation behavior was tuned by microstructural parameters, in terms of fraction of free volumes (FFVs), clusters and atomic packing efficiencies (APEs) to classify the evolution phenomena. The observed variations of APE and FFV values underscored the distinctions in the deformation behavior of the MG models. However, annealing-induced structural changes significantly influenced the initiation and propagation of shear transition zones, formation of shear bands and the overall deformation behavior with a beneficial strengthening effect. In totality, this work has provided compelling results to demystify the intricacies associated with the microstructural tuning of deformation behavior in annealed MGs. (c) 2021 Elsevier B.V. All rights reserved.

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