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- Title
Orientation-Independent Yield Stress and Activation Volume of Dislocation Nucleation in LiTaO3 Single Crystal by Nanoindentation.
- Authors
Ma, Yi; Huang, Xianwei; Song, Yuxuan; Hang, Wei; Yuan, Julong; Zhang, Taihua
- Abstract
Relying on nanoindentation technology, we investigated the elastic-to-plastic transition via first pop-in event and estimated the corresponding shear stress for incipient plasticity, i.e., yielding in the three typical orientations, i.e., X-112°, Y-36°, and Y-42° planes. The occurrence of incipient plasticity exhibited a stochastic distribution in a wide range for the three orientations. Accordingly, the obtained values of yield stress were uniform and scattered in the range from about 4 to 7 GPa for LiTaO3 single crystal. The orientation effect on yield stress at the nano-scale was revealed to be insignificant in LiTaO3 single crystal. The yield stresses were 5.44 ± 0.41, 5.74 ± 0.59, and 5.34 ± 0.525 GPa for the X-112°, Y-36°, and Y-42° planes, respectively. The activation volumes of dislocation nucleation were computed based on the cumulative distribution of yield stress, which were 12 Å3, 8 Å3, and 9 Å3 for the X-112°, Y-36°, and Y-42° planes. The results indicated that point-like defects could be the source of plastic initiation on the surface of LiTaO3 single crystal.
- Subjects
YIELD stress; DISLOCATION nucleation; SINGLE crystals; NANOINDENTATION; SHEARING force; STRESS concentration; LITHIUM tantalate
- Publication
Materials (1996-1944), 2019, Vol 12, Issue 17, p2799
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma12172799