Mechanical deformation of single-crystal ZnO
Mechanical deformation of single-crystal ZnO
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DOI：
10.1063/1.1448175
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发表时间：
2002-02-11
影响因子：
4
通讯作者：
Swain, MV
中科院分区：
文献类型：
--
作者：
Kucheyev, SO;Bradby, JE;Swain, MV
通过球形纳米压痕和原子力显微镜的结合研究了块体 ZnO 单晶的变形行为。结果表明，ZnO 在相对较低的载荷下（大于或类似于 4-13 mN，使用类似于 4.2 μm 半径的球形压头）表现出塑性变形。有趣的是，弹塑性变形转变阈值取决于加载速率，平均而言，加载速度越快，阈值越大。在压痕加载过程中，观察到力-位移曲线中的多个不连续性（所谓的“弹出”事件）。卸载时未观察到不连续性。滑移被认为是 ZnO 塑性变形的主要模式，弹出事件归因于滑移的引发。对部分加载-卸载数据的分析表明，对于 300 nm 的塑料渗透深度，硬度和杨氏模量值分别为 5.0+/-0.1 和 111.2+/-4.7 GPa。讨论了决定 ZnO 变形行为的物理过程。 (C) 2002 年美国物理研究所。
The deformation behavior of bulk ZnO single crystals is studied by a combination of spherical nanoindentation and atomic force microscopy. Results show that ZnO exhibits plastic deformation for relatively low loads (greater than or similar to4-13 mN with an similar to4.2 mum radius spherical indenter). Interestingly, the elastic-plastic deformation transition threshold depends on the loading rate, with faster loading resulting, on average, in larger threshold values. Multiple discontinuities (so called "pop-in" events) in force-displacement curves are observed during indentation loading. No discontinuities are observed on unloading. Slip is identified as the major mode of plastic deformation in ZnO, and pop-in events are attributed to the initiation of slip. An analysis of partial load-unload data reveals values of the hardness and Young's modulus of 5.0+/-0.1 and 111.2+/-4.7 GPa, respectively, for a plastic penetration depth of 300 nm. Physical processes determining deformation behavior of ZnO are discussed. (C) 2002 American Institute of Physics.