Open AccessSIMPLIFIED ELASTIC DIPOLE MODEL OF NONLINEAR STRESS-INDUCED DIFFUSION OF INTERSTITIALS
Author(s) -
Sun Zhong-Qi,
Fang-Xing Jiang
Publication year - 1989
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.38.1679
Subject(s) - materials science , condensed matter physics , dislocation , nonlinear system , dipole , relaxation (psychology) , diffusion , stress (linguistics) , stress field , stress relaxation , physics , creep , thermodynamics , quantum mechanics , composite material , psychology , social psychology , linguistics , philosophy , finite element method
A simplified model of one dimensional elastic dipole discrete lattice containing oscillating dislocations is proposed to study the nonlinear stress-induced diffusion of interstitials in the inhomogeneous stress field of dislocation and to set up a foundation for further numerical calculation in real crystals, consequently, to clarify the interaction of the external stress, the dislocations and the octahedral interstitials in bcc crystals and to explain S-K relaxation and the effect of dislocation on Snoek relaxation theoretically. The simulation computation shows that the nonlinear diffusion of interstitials induced by the dislocation stress field makes the interstitials form a Fermi-Dirac distrubution of defects and enhances Snoek effect, hence, a peak of Snoek effect of nonlinear diffusion appears at higher temperature than that of Snoek peak.