Stochastic Dislocation Dynamics for Dislocation-Defects Interaction: A Multiscale Modeling Approach

[+] Author and Article Information
Masato Hiratani, Hussein M. Zbib

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920

J. Eng. Mater. Technol 124(3), 335-341 (Jun 10, 2002) (7 pages) doi:10.1115/1.1479693 History: Received February 19, 2002; Revised March 08, 2002; Online June 10, 2002
Copyright © 2002 by ASME
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Transition of velocity distribution when initial velocity is set to be −100 m/s
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Obstacle force profile at various relative positions of a perfect dislocation
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(a) (upper left) and (b) (upper right). Dislocation velocity at each average dislocation position, for T=300 K (Fig. 3(a)) and for T=100 K (Fig. 3(b)). (c) (lower left) and (d) (lower right). Average dislocation position at each time, for T=300 K (Fig. 3(d)) and for T=100 K (Fig. 3(d)).
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Stress dependence of the average dislocation velocity at two different temperatures
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Shockley partials gliding on (1̄11̄) toward a truncated SFT viewed from the outside of Thomson’s tetrahedron. Partials above SFT in the figure is referred as an unlike case, and ones below the SFT as alike case.
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System energy for Shockley partials gliding on (1̄11̄) planes for unlike cases. d is the interval between each glide plane and BCD plane of the SFT. The energy is converted per vacancy.
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Dislocation pile-ups on (1̄11̄) plane viewed from the [1̄01] direction. AB corresponds to the stable position of glissile Shockley partial when the leading intersects AD (or AA), and AB denotes the (critical) anchoring position.
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Activation energy with dislocations pile-ups at various planes. Curves labeled (u) corresponds to an unilike case, and others to the alike cases. The energy is converted per vacancy.




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