1. Nanoscale anisotropic plastic deformation in single crystal GaN
- Author
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Hui Yang, Jianfeng Wang, Ke Xu, Xionghui Zeng, Mu Tong Niu, Jun Huang, and Ying Min Fan
- Subjects
Materials science ,Nano Express ,nanoindentation ,Modulus ,Nanotechnology ,Cathodoluminescence ,cathodoluminescence ,Nanoindentation ,Condensed Matter Physics ,anisotropic ,GaN ,Materials Science(all) ,Transmission electron microscopy ,transmission electron microscopy ,hydride vapor phase epitaxy ,General Materials Science ,Deformation (engineering) ,Composite material ,Anisotropy ,Single crystal ,Nanoscopic scale - Abstract
Elasto-plastic mechanical deformation behaviors of c-plane (0001) and nonpolar GaN single crystals are studied using nanoindentation, cathodoluminescence, and transmission electron microscopy. Nanoindentation tests show that c-plane GaN is less susceptible to plastic deformation and has higher hardness and Young's modulus than the nonpolar GaN. Cathodoluminescence and transmission electron microscopy characterizations of indent-induced plastic deformation reveal that there are two primary slip systems for the c-plane GaN, while there is only one most favorable slip system for the nonplane GaN. We suggest that the anisotropic elasto-plastic mechanical properties of GaN are relative to its anisotropic plastic deformation behavior. PACS: 62.20.fq; 81.05.Ea; 61.72.Lk.
- Published
- 2011