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

Autor:	Yoshiko H. Ohashi, Mitsuru Fukuchi, Kazutoshi Ohashi
Rok vydání:	1990
Předmět:	Dislocation creep Condensed Matter::Materials Science Materials science Condensed matter physics Phonon Impurity Condensed Matter::Superconductivity Peierls stress Atom General Physics and Astronomy Climb Dislocation Kinetic energy
Zdroj:	Journal of the Physical Society of Japan. 59:3260-3268
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.59.3260
Popis:	Depinning process of a dislocation from an obstacle has been investigated by using the method of computer simulation. The motion of a dislocation is analyzed by using the Frenkel-Kontorova model in which both effects of an impurity atom and temperature are included. When an impurity atom shows strong effect on a dislocation, the dislocation may be trapped by the defect. But, with increasing temperature, the dislocation may be escaped from the defect with the help of thermal phonon. When this depinning process occurs in the lower temperature region, the dislocation climbs the defect potential well with extending its core size. On the other hand, when the depinning process occurs in the high temperature region, the oscillating dislocation can climb the well just as a classical particle because of its large kinetic energy.
Databáze:	OpenAIRE
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