Predicting Dislocation Climb and Creep from Explicit Atomistic Details
Author(s)Kabir, Mohammad Mukul; Lau, Timothy T.; Rodney, David; yip, Sidney; Van Vliet, Krystyn J.
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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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Physical Review Letters
American Physical Society
Kabir, Mukul et al. "Predicting Dislocation Climb and Creep from Explicit Atomistic Details." Physical Review Letters 105.9 (2010): 095501. © 2010 The American Physical Society
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