Nano-scale elastic-plastic properties and indentation-induced deformation of single crystal 4H-SiC
MetadataShow full item record
The nanoscale elastic-plastic response of single crystal 4H-SiC has been investigated by nanoindentationwith a Berkovich tip. The hardness (H) and elastic modulus (E) determined in the load-independent region were 36±2 GPa and 413±8 GPa, respectively. The indentation size effect (ISE) of hardness within an indentation depth of 60 nm was systematically analyzed by the Nix-Gao model. Pop-in events occurring at a depth of ~23 nm with indentation loads of 0.60-0.65 mN were confirmed to indicate the elastic-plastic transition of the crystal, on the basis of the Hertzian contact theory and Johnson's cavity model. Theoritically calculated maximum tensile strength (13.5 GPa) and cleavage strength (33 GPa) also affirms the deformation due to the first pop-in rather than tensile stresses. Further analyses of deformation behavior across the indent was done in 4H-SiC by a combined technique of focused ion beam and transmission electron microscope, revealing that slippage occurred in the (0001) plane after indentation.
Showing items related by title, author, creator and subject.
Nanoscale elastic-plastic deformation and mechanical properties of 3C-SiC thin film using nanoindentationNawaz, A.; Islam, B.; Mao, W.; Lu, Chunsheng; Shen, Y. (2018)The elastic-plastic deformation of 3C-SiC thin film was investigated by a nanoindenter equipped with the Berkovich tip. Transition from pure elastic to elastic-plastic deformation was evidenced at an approximate load of ...
Optical coherence tomography-based contact indentation for diaphragm mechanics in a mouse model of transforming growth factor alpha induced lung diseaseWang, K.; Astell, C.; Wijesinghe, P.; Larcombe, Alexander; Pinniger, G.; Zosky, G.; Kennedy, B.; Berry, L.; Sampson, D.; James, A.; Le Cras, T.; Noble, P. (2017)This study tested the utility of optical coherence tomography (OCT)-based indentation to assess mechanical properties of respiratory tissues in disease. Using OCT-based indentation, the elastic modulus of mouse diaphragm ...
Characterization of stress-strain relationships of elastoplastic materials: an improved method with conical and pyramidal indentersMa, Z.; Zhou, Y.; Long, S.; Zhong, X.; Lu, Chunsheng (2012)The load-displacement curve in indentation is widely used to extract elastoplastic properties of materials. It is believed that such a measurement is non-unique and a full stress-strain curve cannot be obtained with a ...