The dissociation energy of extended dislocations in fcc lattices Export

@article{citeulike:4371634, abstract = {The dissociation of a dislocation in the \&lcub;111\&rcub; plane of a fee crystal into two Shockley partials is studied in the framework of the generalized Peierls model. The interplanar atomic misfit energy (the \&b.gamma;-surface) is represented by a two-dimensional Fourier series in which the ‘stacking fault energy’ \&b.gamma;_<i>g</i> and the maximum stacking energy \&b.gamma;_<i>m</i> can be varied independently. Whereas for Volterra dislocations the separation <i>d</i>₀ of the Shockley partials depends only on \&b.gamma;_<i>g</i>, it turns out that in the more general treatment the equilibrium separation <i>d</i> depends also on \&b.gamma;_<i>m</i>. Hence previous experimental determinations of \&b.gamma;_<i>g</i> from TEM observations have to be re-evaluated. The energy \&b.Delta;<i>E</i>_p to recombine the two Shockley partials also depends on the value of \&b.Delta;<i>E</i>_v. Agreement with the dissociation energy \&b.Delta;<i>E</i>_v for a Volterra dislocation in screw orientation can only be obtained when the ‘recombination radius’ is chosen <i>r</i>_c \&ap; 0.15<i>b</i>.}, author = {Schoeck, Gunther}, citeulike-article-id = {4371634}, citeulike-linkout-0 = {http://dx.doi.org/10.1080/01418619908210356}, doi = {10.1080/01418619908210356}, journal = {Philosophical Magazine A}, keywords = {pfm}, number = {5}, pages = {1207--1215}, posted-at = {2009-04-21 11:00:29}, priority = {0}, publisher = {Taylor \& Francis}, title = {The dissociation energy of extended dislocations in fcc lattices}, url = {http://dx.doi.org/10.1080/01418619908210356}, volume = {79}, year = {1999} }

TY - JOUR ID - citeulike:4371634 L3 - citeulike-article-id:4371634 N2 - The dissociation of a dislocation in the &lcub;111&rcub; plane of a fee crystal into two Shockley partials is studied in the framework of the generalized Peierls model. The interplanar atomic misfit energy (the &b.gamma;-surface) is represented by a two-dimensional Fourier series in which the ‘stacking fault energy’ &b.gamma;_<i>g</i> and the maximum stacking energy &b.gamma;_<i>m</i> can be varied independently. Whereas for Volterra dislocations the separation <i>d</i>₀ of the Shockley partials depends only on &b.gamma;_<i>g</i>, it turns out that in the more general treatment the equilibrium separation <i>d</i> depends also on &b.gamma;_<i>m</i>. Hence previous experimental determinations of &b.gamma;_<i>g</i> from TEM observations have to be re-evaluated. The energy &b.Delta;<i>E</i>_p to recombine the two Shockley partials also depends on the value of &b.Delta;<i>E</i>_v. Agreement with the dissociation energy &b.Delta;<i>E</i>_v for a Volterra dislocation in screw orientation can only be obtained when the ‘recombination radius’ is chosen <i>r</i>_c &ap; 0.15<i>b</i>. IS - 5 JF - Philosophical Magazine A EP - 1215 TI - The dissociation energy of extended dislocations in fcc lattices PB - Taylor & Francis VL - 79 SP - 1207 KW - pfm AU - Schoeck, Gunther PY - 1999/// UR - http://dx.doi.org/10.1080/01418619908210356 ER -