Surface Effects on Plastic Deformation.
Abstract
The present computer simulation study of the dislocation distribution near the surface is based upon a modified one-dimensional dislocation model which considers the line tension of a dislocation loop, and the image forces. If the dislocations are generated from a surface source and move by thermal activation over randomly distributed short range barriers, an inverse pile-up is created. A dislocation density gradient exists up to a depth of approximately 60 micrometers, for a total of twenty dislocations generated. During unloading, the last few dislocations generated leave the crystal rapidly, and within three hours to two weeks the dislocation density gradient essentially disappears (depending upon the parameters used). This is in agreement with the experimental results. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 1980
- Accession Number
- ADA085140
Entities
People
- I. R. Kramer
- R. J. Arsenault
Organizations
- University of Maryland