Destabilization of dislocation dipole at high velocity

Wang, Jian; Woo, C. H.; Huang, Hanchen
November 2001
Applied Physics Letters;11/26/2001, Vol. 79 Issue 22, p3621
Academic Journal
Under mechanical deformation of very high strain rates, it is expected that dislocations may move very fast (being subsonic, transonic, or even supersonic). As a result, two dislocations may approach each other at high velocities. Our earlier analyses of linear elasticity indicate that a dipole is destabilized when the approaching velocity is high enough—even below the speed of sound. In this letter, using the molecular dynamics method, we demonstrate that a dipole indeed can be destabilized above a critical velocity, and stable below that. © 2001 American Institute of Physics.


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