Picosecond time scale imaging of mechanical contacts
Picosecond time scale imaging of mechanical contacts
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DOI：
10.1016/j.ultras.2009.08.008
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发表时间：
2010-02-01
期刊：
影响因子：
4.2
通讯作者：
Voti, Roberto Li
中科院分区：
文献类型：
--
作者：
Dehoux, Thomas;Wright, Oliver B.;Voti, Roberto Li
利用超快光声技术研究了蓝宝石衬底上铬薄膜在陶瓷球轴承上的纳米压痕。在类似于40 GHz的声脉冲从膜压头接口返回允许膜压痕轮廓被探测到亚纳米分辨率超过接触面积类似于25 μ m的半径。由此揭示了加载期间膜的变形。此外，同时实现了在兆赫频率下的接触的热波成像。(C)2009年爱思唯尔B。V.保留所有权利。
By means of an ultrafast opto-acoustic technique we study the nanoindentation of thin chromium films on sapphire substrates using a ceramic ball bearing. Acoustic pulses at similar to 40 GHz returning from the film-indenter interface allow the film indentation profiles to be probed to sub-nanometer resolution over contact areas similar to 25 mu m in radius. The deformation of the films during loading is thereby revealed. Furthermore, thermal wave imaging of the contact at megahertz frequencies is simultaneously achieved. (C) 2009 Elsevier B. V. All rights reserved.