Fast rejuvenation in bulk metallic glass induced by ultrasonic vibration precompression
Fast rejuvenation in bulk metallic glass induced by ultrasonic vibration precompression
复制标题
超声波振动预压缩诱导大块金属玻璃快速再生
DOI：
10.1016/j.intermet.2019.106687
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发表时间：
2020-03-01
期刊：
影响因子：
4.4
通讯作者：
Liu, Zhiyuan
中科院分区：
文献类型：
--
作者：
Lou, Yan;Liu, Xiao;Liu, Zhiyuan
调节亚稳大块金属玻璃的能态对于理解其玻璃性质和控制其性能具有重要意义。采用超声振动预压（UVPC）方法，实现了锆基非晶合金在几秒钟内的快速再生。再生后的非晶合金组织更加不均匀，塑性大大提高。揭示了潜在的机制。在UVPC处理过程中，由于BMG的非均匀原子堆积结构，高频应变能被转换为热能/内能。外部施加的弹性应力、内部的转换热和原子的超声共振的综合作用，将松散堆积的原子驱动到更高的能量盆，同时在BMG结构中引入更多的自由体积。因此，UVPC处理的BMG具有更多的储能和更多的流动单元来启动剪切带。本文的研究结果为调控非晶材料的能态提供了一种有效的方法，并为全面理解非晶材料的能量-结构-性能关系提供了新的思路。
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-structureproperties relationship of amorphous materials.