Author : Wei Cai
Publisher :
ISBN 13 :
Total Pages : 321 pages
Book Rating : 4.:/5 (497 download)
Book Synopsis Atomistic and Mesoscale Modeling of Dislocation Mobility by : Wei Cai
Download or read book Atomistic and Mesoscale Modeling of Dislocation Mobility written by Wei Cai and published by . This book was released on 2001 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) We have investigated dislocation core and kink mechanisms and obtained deeper understandings on the shuffle-glide controversy in Si and edge versus screw dislocations in BCC Mo, with some of these breakthroughs related to a better control of artificial boundary effects. The atomistic-mesoscale coupling is then manifested in our formulation of a kinetic Monte Carlo description of dislocation glide in Si at the mesoscale, based on kink mechanisms. As a result, the nature of "weak obstacles" to kink propagation, a long-standing postulate for interpreting low stress dislocation mobility data, is clarified. This model is then generalized to incorporate cross slip for modeling screw dislocation motion in a BCC lattice. Lastly, a physically-motivated procedure is derived for removing the stress singularity in mesoscale dislocation dynamics simulations.