Modelling of dislocation generation and interaction during high-speed deformation of metals

Details Modelling of dislocation generation and interaction during high-speed deformation of metals Modelling of dislocation generation and interaction during high-speed deformation of metals

2000-08-23

arxiv.org/abs/cond-mat/0008336v1

Radiation Effects and Defects in Solids, vol. 157, pp. 193-200 (2002).

Physics

Condensed Matter

Materials Science

8 pages, LaTeX2e + PS figures. Presented at the Third Workshop on High-speed Plastic Deformation, Hiroshima, August 2000

Scientific paper

Recent experiments by Kiritani et al. have revealed a surprisingly high rate of vacancy production during high-speed deformation of thin foils of fcc metals. Virtually no dislocations are seen after the deformation. This is interpreted as evidence for a dislocation-free deformation mechanism at very high strain rates. We have used molecular-dynamics simulations to investigate high-speed deformation of copper crystals. Even though no pre-existing dislocation sources are present in the initial system, dislocations are quickly nucleated and a very high dislocation density is reached during the deformation. Due to the high density of dislocations, many inelastic interactions occur between dislocations, resulting in the generation of vacancies. After the deformation, a very high density of vacancies is observed, in agreement with the experimental observations. The processes responsible for the generation of vacancies are investigated. The main process is found to be incomplete annihilation of segments of edge dislocations on adjacent slip planes. The dislocations are also seen to be participating in complicated dislocation reactions, where sessile dislocation segments are constantly formed and destroyed.

Affiliated with

Also associated with

No associations

Rating

Modelling of dislocation generation and interaction during high-speed deformation of metals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modelling of dislocation generation and interaction during high-speed deformation of metals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modelling of dislocation generation and interaction during high-speed deformation of metals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-355648