On the Room-Temperature Creep Behavior and Its Correlation with Length Scale of a LiTaO3 Single Crystal by Spherical Nanoindentation
On the Room-Temperature Creep Behavior and Its Correlation with Length Scale of a LiTaO3 Single Crystal by Spherical Nanoindentation
复制标题
球形纳米压痕研究LiTaO3单晶的室温蠕变行为及其与长度尺度的相关性
DOI：
10.3390/ma12244213
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发表时间：
2019-12-02
期刊：
影响因子：
3.4
通讯作者：
Ma, Yi
中科院分区：
文献类型：
--
作者：
Hang, Wei;Huang, Xianwei;Ma, Yi
利用纳米压痕技术，研究了典型取向（012）的钽酸锂单晶的室温蠕变行为，Y-42度平面。采用半径分别为0.76、2.95和9.8 μ m的三种球形针尖，研究了纳米压痕长度尺度对弹性和塑性区蠕变变形的影响。从表面上看，无论是蠕变位移和速率几乎线性增加，增加持有深度和独立的尖端尺寸，这可以归因于同时扩大的持有应变和变形体积下压头。在相似的保持应变下，蠕变变形，即，蠕变应变和应变速率在较小的球形尖端下更明显。还估计了不同球形尖端和保持应变下蠕变流动的应变率敏感性。讨论了钽酸锂在高剪切压应力下的室温蠕变机制。
Relying on nanoindentation technology, the room-temperature creep behavior of a LiTaO3 single crystal in the typical orientation (012), i.e., Y-42 degrees plane was investigated. Three kinds of spherical tips with the radii of 0.76, 2.95 and 9.8 mu m were respectively applied to detect nanoindentation length scale effect on creep deformation at both elastic and plastic regions. Superficially, both creep displacement and rate were nearly linearly increased with increasing holding depth and independent of tip size, which could be ascribed to the simultaneously enlarged holding strain and deformation volume beneath the indenter. At a similar holding strain, creep deformation, i.e., creep strain and strain rate were more pronounced under smaller spherical tips. Strain rate sensitivities of creep flows under different spherical tips and holding strains were also estimated. The potential room-temperature creep mechanism of LiTaO3 under high shear compression stress was discussed.