Predicting dislocation climb and creep from explicit atomistic details.
Phys Rev Lett
; 105(9): 095501, 2010 Aug 27.
Article
em En
| MEDLINE
| ID: mdl-20868174
ABSTRACT
Here we report kinetic Monte Carlo simulations of dislocation climb in heavily deformed, body-centered cubic iron comprising a supersaturation of vacancies. This approach explicitly incorporates the effect of nonlinear vacancy-dislocation interaction on vacancy migration barriers as determined from atomistic calculations, and enables observations of diffusivity and climb over time scales and temperatures relevant to power-law creep. By capturing the underlying microscopic physics, the calculated stress exponents for steady-state creep rates agree quantitatively with the experimentally measured range, and qualitatively with the stress dependence of creep activation energies.
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En
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Phys Rev Lett
Ano de publicação:
2010
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Article