Authors: O. Kum
Affilation: Clemson University, United States
Pages: 111 - 114
Keywords: nanoindentation, anisotropy, indentation curve, dislocation nucleation
Orientation effects in nanomechanical properties at the surfaces with molecular dyanmics were observed as a function of indenter size and indenter speed in three crystal orientations: 100, 110, and 111. The force vs displacement curves for indentation follows the Hertzian solution for elastic deformation of F = kd^1.5. However, the force fitted constant k showed a dependency on indenter size, velocity, and crystal orientations. The results of dislocation nucleations in different orientations also showed anisotropy: Stacking faults in the 100 deep partial dislocations in the 110 shallow partial dislocations followed by the stacking faults in the 111.