KINEMATIC GENERATION OF DISLOCATIONS

J. SCHIØTZ(1), K. W. JACOBSEN

Center for Atomic Scale Materials Physics (CAMP) and Physics Department, Building 307, Technical University of Denmark, DK-2800 Lyngby, Denmark.

O. H. NIELSEN

UNI-C, Building 304, Technical University of Denmark, DK-2800, Lyngby, Denmark and Joint Research Center for Atom Technology (JRCAT), 1-1-4 Higashi, Tsukuba, Ibaraki 305, Japan

(1) Present address: Department of Physics, Washington University, St. Louis, Missouri 63130, USA.

Abstract

In this letter we present evidence from computer simulations that edge dislocations can be generated by purely kinematic processes, in the absence of more conventional dislocation sources. New dislocation pairs may be generated near high-velocity dislocations. These kinematic processes are only active under high stresses, but may be important under shock loading or under other conditions where a very high strain rate is obtained. This dislocation generation becomes possible because the sign of the force between edge dislocations changes when the dislocation velocity exceeds the Rayleigh velocity.

Philosophical Magazine Letters 72, 245-250 (1995)

A preprint is available as compressed PostScript (7 pages, 435 kB compressed, 1.6 MB uncompressed)

Last modified: September 19, 1996

Jakob Schiøtz, schiotz@fysik.dtu.dk