Nondestructive characterization of polycrystalline 3D microstructure with time-domain Brillouin scattering
Nondestructive characterization of polycrystalline 3D microstructure with time-domain Brillouin scattering
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DOI：
10.1016/j.scriptamat.2019.02.037
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发表时间：
2019-06
影响因子：
6
通讯作者：
Yuzhou Wang;D. Hurley;Z. Hua;G. Sha;S. Raetz;V. Gusev;M. Khafizov
中科院分区：
文献类型：
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作者：
Yuzhou Wang;D. Hurley;Z. Hua;G. Sha;S. Raetz;V. Gusev;M. Khafizov
我们采用千兆赫频率的超声波，非侵入性成像多晶氧化铈的晶粒微结构。这种技术被称为时域布里渊散射（TDBS），是一种泵浦-探测技术，当超声波传播到样品中时发射并监测超声波。我们证明了TDBS的能力，通过测量模式和深度相关的声速图像的微观结构。该技术提供了足够的对比度来识别晶粒，并提供了重建亚表面晶界位置的方法。结果与电子背散射衍射测量结果相吻合。该工作拓展了TDBS在三维结构成像中的应用，为晶界的无损表征提供了新的途径。
We employ gigahertz frequency ultrasonic waves to non-invasively image grain microstructure in polycrystalline ceria. This technique, termed time-domain Brillouin scattering (TDBS), is a pump-probe technique that launches and monitors ultrasonic waves as they propagate into the sample. We demonstrate TDBS's capability to image microstructure by measuring mode and depth dependent acoustic velocities. The technique provides sufficient contrast to identify grains and offers means to reconstruct subsurface grain boundary's location. The results compare closely with electron backscatter diffraction measurement. This work expands the application of TDBS to 3D structural imaging and offers new route for the nondestructive characterization of grain boundary.