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<p>This study systematically investigated the shear deformation behavior of a Zr-based bulk metallic glass (BMG) under varying mechanical stimuli. Nanoindentation tests with Berkovich and Cube corner indenters were conducted at loading rates from 40 to 4000&#xa0;µN/s to elucidate the effects of indenter geometry and loading kinetics on serrated flow, characterized by pop-in events in load-displacement (<i>P</i>-<i>h</i>) curves. Uniaxial compression tests on micro-pillars (1-5&#xa0;µm in diameter) were performed to spatially resolve shear band evolution and examine size effects. Post-deformation microstructural characterization via TEM revealed nanoscale crystallization within and adjacent to shear bands. The results demonstrate that sharper indenters and lower loading rates promote discrete, pronounced pop-ins associated with individual shear band operations, while higher rates lead to smoother deformation mediated by multiple, simultaneous shear bands. The observed deformation-induced nanocrystallization, originating from localized atomic rearrangement in shear bands, highlights the intrinsic link between mechanical instability and microstructural evolution.</p>

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The Deformation Behavior of a Zr-Based Bulk Metallic Glass under Indentation and Micro-Compression Tests

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Qiaoling Chu,
  • Jin Liu,
  • Weifeng Zheng,
  • Jiale Bai,
  • Ruoxuan Liu,
  • Zhikun Wang,
  • Junyao Wang,
  • Dan Yang,
  • Fuxue Yan

摘要

This study systematically investigated the shear deformation behavior of a Zr-based bulk metallic glass (BMG) under varying mechanical stimuli. Nanoindentation tests with Berkovich and Cube corner indenters were conducted at loading rates from 40 to 4000 µN/s to elucidate the effects of indenter geometry and loading kinetics on serrated flow, characterized by pop-in events in load-displacement (P-h) curves. Uniaxial compression tests on micro-pillars (1-5 µm in diameter) were performed to spatially resolve shear band evolution and examine size effects. Post-deformation microstructural characterization via TEM revealed nanoscale crystallization within and adjacent to shear bands. The results demonstrate that sharper indenters and lower loading rates promote discrete, pronounced pop-ins associated with individual shear band operations, while higher rates lead to smoother deformation mediated by multiple, simultaneous shear bands. The observed deformation-induced nanocrystallization, originating from localized atomic rearrangement in shear bands, highlights the intrinsic link between mechanical instability and microstructural evolution.