Depinning of a Dislocation from an Impurity Atom in the Frenkel-Kontorova Model

概要

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Depinning process of a dislocation from an obstacle has been investigated by usingthe method of computer simulation. The motion of a dislocation is analyzed by usingthe Frenkel-Kontorova model in which both effects of an impurity atom and tempera-Lure are included. When an impurity atom shows strong effect on a dislocation, thedislocation may be trapped by the defect. But, with increasing temperature, thedislocation may be escaped from the defect with the help of thermal phonon. Whenthis depinning process occurs in the lower temperature region, the dislocation climbsthe defect potential well with extending its core size. On the other hand, when thedepinning process occurs in the high temperature region, the oscillating dislocationcan climb the well just as a classical particle because of its large kinetic energy.
社団法人日本物理学会の論文
1990-09-15