Anisotropy Behavior of Dislocation Nucleation from a Sharp Corner in Copper

Yu SUN, Satoshi IZUMI, Shotaro HARA, Shinsuke SAKAI
2011 Journal of Computational Science and Technology  
By means of reaction pathway analysis, we have investigated the nucleation of 90 • and 30 • partial dislocation from a sharp corner in an f.c.c. crystal copper. The anisotropy aspects of dislocation nucleation revealed by the results have shown that the stressdependent activation energy of 30 • partial dislocation is approximately twice over the counterpart of 90 • partial dislocation, and that the maximum inelastic displacement for the former is also higher. Moreover, the shape of the
more » ... int configuration of 30 • partial dislocation is similar to a half-ellipse whereas in the case of 90 • partial dislocation it is more like a semi-circle, reflecting the different Peierls barriers influenced by the Burgers vectors. Further study of the surface reconstruction demonstrates that although the nucleation of 30 • partial dislocation has been enhanced by surface reduction, it is still more energy-unfavorable than the 90 • partial dislocation. These results suggest that the higher Peierls barrier is responsible for the larger activation energy of 30 • partial dislocation nucleation.
doi:10.1299/jcst.5.54 fatcat:oz3vbiw2lbchnh4evskacbqg7e