Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10620283 | Acta Materialia | 2013 | 13 Pages |
Abstract
Incipient plasticity in Mg single crystals was investigated using the pop-ins generated during spherical nanoindentation on (0Â 0Â 0Â 1), (1Â 0Â â1Â 2) and (1Â 0Â â1Â 0) surfaces. Representative deformed regions extracted from underneath indents by means of focused ion beam machining were examined by transmission electron microscopy (TEM) to identify the deformation mechanisms. Anisotropic elastic Hertzian contact theory was used to calculate indentation Schmid factors and the relevant resolved shear stresses at pop-in from the load-displacement curves. The pop-in statistics in conjunction with the TEM analysis showed that the most likely deformation mechanism responsible for pop-in is slip via ãaã dislocations even in the case of indentation along the c-axis.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
D. Catoor, Y.F. Gao, J. Geng, M.J.N.V. Prasad, E.G. Herbert, K.S. Kumar, G.M. Pharr, E.P. George,