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Dynamical Effects on Dislocation Glide through Weak Obstacles

Published online by Cambridge University Press:  01 February 2011

Masato Hiratani  and
Vasily V. Bulatov
Masato Hiratani
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
Vasily V. Bulatov
Affiliation:
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
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Abstract

Underdamped dislocation motion through local pinning obstacles is studied computationally using a stochastic dislocation dynamics scheme. The global dislocation velocity is observed to be non-linearly stress dependent. Strongly non-Arrhenius dynamics are found at a higher stress range. The statistical analysis indicates that the correlation of the local dislocation kinetic energy is extended and exceeds the average obstacle spacing as temperature decreases, which can lead to the inertial dislocation bypass of the obstacles.

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References

[1] Blatter, G. et al. , Rev. Mod. Phys. 66 (1125)Google Scholar
[2] Vinokur, V. M. Marchetti, M.C. Chen, L.W. Phys. Rev. Lett. 77, 1845 (1996).Google Scholar
[3] Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, (McGraw-Hill, NewYor, Tronto, London, 1953) p.140.Google Scholar
[4] Nadgorny, E. M., Dislocation Dynamics and Mechanical Properties of Crystals, in Progress In Material Science 31, Eds. Christian, J. W. Haasen, P. and Massalski, T.B. (Pergamon Press, Oxford, 1988) 142&329.Google Scholar
[5] Kolomeisky, E. B. Curcic, T. and Straley, J. P. Phys. Rev. Lett. 75, 1775 (1995)Google Scholar
[6] Al'shitz, V. I., The Phonon Dislocation Interaction and its Role in Dislocation Dragging and Thermal Resistivity, in Elastic Strain and Dislocation Mobility, 31, Modern Problems in Condensed Matter Sciences, Eds. Indenbom, V. L. and Lothe, J.. (North-Holland, Amsterdam, 1992).Google Scholar
[7] Granato, A.V. Phys. Rev. Lett. 27 660 (1971)Google Scholar
[8] Devincre, B. and Kubin, L. P. Mater. Sci. Eng., A8, 234 (1997)Google Scholar
[9] Zbib, H. M. Rhee, M. and Hirth, J. P. Int. J. Mech. Sci., 40, 11 (1998)Google Scholar
[10] Ghoniem, N. M. Tong, S.-H., and Sun, L.Z. Phys. Rev. B, 61, 913 (2000)Google Scholar
[11] Raabe, D. Computational Materials Science, (Wiley-VCH, Weinheim, 1998) Chap. 9.Google Scholar
[12] Ronnpagel, D. Streit, T. and Pretorius, T. Phys. Stat. Sol. A, 135, 445 (1993).Google Scholar
[13] Shear modulus μ = 54.6 GPa, Poisson ratio v = 0.324, the magnitude of the perfect dislocation b = 2.56 Å, the speed of shear wave c = 2.48×103 m/s, the stacking fault energy γ = 4.50×10-2 J/m2, and the drag coefficient B = 29.0 μPa s at 200K and B = 51.0 μPa s at 600K.Google Scholar
[14] Cai, W. et al. , Phil. Mag. 83, 539 (5), (2001)Google Scholar
[15] Mordehai, D. et al. , Phys. Rev. B 67, 024112 (2003)Google Scholar