Abstract Tuning energy state of metastable bulk metallic glasses (BMGs) is well known significant for understanding their glass nature and controlling their performances. Using a newly developed ultrasonic vibration precompression (UVPC) method, fast rejuvenation is achieved in a Zr-based BMG in seconds. The rejuvenated BMG has more heterogeneous structure and largely improved plasticity. The underlying mechanism is revealed. During UVPC treatment, high frequency strain energy is converted into thermal/internal energy due to heterogeneous atomic packing structure of BMG. The combined effect, resulting from external applied elastic stress, internal converted heat and ultrasonic resonance of atoms, drives the loosely packed atoms to a higher energy basin and simultaneously introduces more free volumes in the structure of the BMG. Therefore, the UVPCed BMG has more stored energy and more flow units to initiate shear bands. The findings in this work provide an effective method to modulate the energy state of BMGs and shed insights into comprehensive understanding of energy-structure-properties relationship of amorphous materials.

中文翻译：

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超声振动预压诱导块状金属玻璃快速再生

摘要 众所周知，调节亚稳态块状金属玻璃 (BMGs) 的能态对于理解其玻璃性质和控制其性能具有重要意义。使用新开发的超声波振动预压缩 (UVPC) 方法，可在几秒钟内在 Zr 基 BMG 中实现快速复原。重新焕发活力的 BMG 具有更多的异质结构和大大提高的可塑性。揭示了潜在的机制。在 UVPC 处理过程中，由于 BMG 的异质原子堆积结构，高频应变能被转换为热/内能。由外部施加的弹性应力、内部转换的热量和原子的超声共振产生的综合效应将松散堆积的原子驱动到更高的能量盆中，同时在 BMG 的结构中引入更多的自由体积。所以，UVPCed BMG 具有更多的储存能量和更多的流动单位来启动剪切带。这项工作的发现提供了一种有效的方法来调节 BMGs 的能量状态，并为全面理解非晶材料的能量-结构-性质关系提供了见解。