Analysis of dislocation nucleation from a crystal surface based on the Peierls-Nabarro dislocation model Export

@article{citeulike:617089, abstract = {Dislocation nucleation from a stressed crystal surface is analyzed based on the Peierls-Nabarro dislocation model. The variational boundary integral approach is used to obtain the profiles of the embryonic dislocations in various three-dimensional nucleation configurations. The stress-dependent activation energies required to activate dislocations from their stable to unstable saddle point configurations are determined. Compared to previous analyses of this type of problem based on continuum elastic dislocation theory, the present analysis eliminates the uncertain core cutoff parameter by allowing for the existence of an extended dislocation core as the embryonic dislocation evolves. Moreover, atomic information can be incorporated to reveal the dependence of the nucleation process on the profile of the atomic interlayer potential as compared to continuum elastic dislocation theory in which only elastic constants and Burgers vector are relevant. Finally, the presented methodology can also be readily used to study dislocation nucleation from the surface heterogeneities such as cracks, steps, and quantum structures of electronic devices.}, author = {Xu, Guanshui and Zhang, Chuanli}, citeulike-article-id = {617089}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/S0022-5096(03)00067-X}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0022-5096(03)00067-X}, citeulike-linkout-2 = {http://www.sciencedirect.com/science/article/B6TXB-48V6N8P-1/2/b571929a331774de44e69ab079a3b4bc}, comment = {This annoying author tells us that surface ledges might lower the activation energy of incipient nucleaition.}, doi = {10.1016/S0022-5096(03)00067-X}, journal = {Journal of the Mechanics and Physics of Solids}, keywords = {incipient-plasticity, size-dependence}, month = {August}, number = {8}, pages = {1371--1394}, posted-at = {2006-05-08 10:56:51}, priority = {2}, title = {Analysis of dislocation nucleation from a crystal surface based on the Peierls-Nabarro dislocation model}, url = {http://dx.doi.org/10.1016/S0022-5096(03)00067-X}, volume = {51}, year = {2003} }

TY - JOUR ID - citeulike:617089 L3 - citeulike-article-id:617089 N2 - Dislocation nucleation from a stressed crystal surface is analyzed based on the Peierls-Nabarro dislocation model. The variational boundary integral approach is used to obtain the profiles of the embryonic dislocations in various three-dimensional nucleation configurations. The stress-dependent activation energies required to activate dislocations from their stable to unstable saddle point configurations are determined. Compared to previous analyses of this type of problem based on continuum elastic dislocation theory, the present analysis eliminates the uncertain core cutoff parameter by allowing for the existence of an extended dislocation core as the embryonic dislocation evolves. Moreover, atomic information can be incorporated to reveal the dependence of the nucleation process on the profile of the atomic interlayer potential as compared to continuum elastic dislocation theory in which only elastic constants and Burgers vector are relevant. Finally, the presented methodology can also be readily used to study dislocation nucleation from the surface heterogeneities such as cracks, steps, and quantum structures of electronic devices. IS - 8 JF - Journal of the Mechanics and Physics of Solids EP - 1394 TI - Analysis of dislocation nucleation from a crystal surface based on the Peierls-Nabarro dislocation model VL - 51 SP - 1371 KW - incipient-plasticity KW - size-dependence N1 - This annoying author tells us that surface ledges might lower the activation energy of incipient nucleaition. AU - Xu, Guanshui AU - Zhang, Chuanli PY - 2003/08// UR - http://dx.doi.org/10.1016/S0022-5096(03)00067-X ER -