Resonance ultrasonic actuation and local structural rejuvenation in metallic glasses
Resonance ultrasonic actuation and local structural rejuvenation in metallic glasses
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DOI：
10.1103/physrevb.95.235407
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发表时间：
2017-06
影响因子：
3.7
通讯作者：
Dongfang Wang;Yong Yang;X. Niu;Jian Lu;G. Yang;Wence Wang;C. Liu
中科院分区：
文献类型：
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作者：
Dongfang Wang;Yong Yang;X. Niu;Jian Lu;G. Yang;Wence Wang;C. Liu
利用接触共振超声激励（CRUA）方法，我们观察到金属玻璃（MG）表面局部结构再生的证据，这是由共振激励后原子振动幅度的增加引起的。通过调整CRUA参数，可以调整再生区的大小、模式和范围。纳米压痕测试显示，抑制后CRUA的剪切带的成核，起源于由超声振动引起的局部结构的均匀化。与退火的结构均匀化方法相比，该方法不会因局部结构约束而牺牲自由体积的集中。这些结果有助于理解MG的微观结构和局部结构复兴的演变，以及具有从纳米尺度到微米尺度的改进的塑性的MG的设计。
Using the method of contact resonance ultrasonic actuation (CRUA), we observed evidence of local structural rejuvenation at the surface of metallic glasses (MGs), arising from the increase of the vibration amplitude of the atoms after the resonance actuation. By adjusting the CRUA parameters, the size, pattern, and extent of the rejuvenated zones could be tailored. Nanoindentation tests revealed suppressed nucleation of shear bands after CRUA, originating from the homogenization of the local structure induced by the ultrasonic vibration. Compared with the structural homogenization from annealing, this method will not sacrifice the concentration of the free volume for the local structural constraint. These results are useful to understand the evolution of the microstructure and local structural rejuvenation of MGs, as well as the design of MGs with improved plasticity from the nanoscale to the microscale.