Skip to main content
Article
Impact of obstacles on dislocation patterning and stress correlations
Physical Review B
  • J. M. Rickman, Lehigh University
  • M. Haatja, Princeton University
  • Richard Alan Lesar, Iowa State University
Document Type
Article
Publication Date
5-6-2008
DOI
10.1103/PhysRevB.77.174105
Abstract

By virtue of their long-ranged nature, elastic stresses due to dislocations may provide a mechanism for the spatial organization of alloys with misfitting constituents. Here, we first explore the connection between dislocation patterning and correlations in elastic stress fields associated with dislocations. Specifically, we examine the impact of obstacles, such as impurities and grain boundaries, on the pattern formation in a collection of mutually interacting dislocations. This is accomplished by characterizing the order in terms of various dislocation structure factors that reflect the tendency to form dislocation wall segments. We find that random stationary impurities frustrate wall formation without altering the characteristic length scale of the dislocation patterning, while grain boundaries promote wall formation via dislocation incorporation, and frustrate polygonization away from the boundaries. We then discuss the implication of the results of induced solute patterning in phase-separating alloys.

Comments

This article is from Physical Review B 77 (2008): 1, doi:10.1103/PhysRevB.77.174105. Posted with permission.

Copyright Owner
The American Physical Society
Language
en
Date Available
2014-09-18
File Format
application/pdf
Citation Information
J. M. Rickman, M. Haatja and Richard Alan Lesar. "Impact of obstacles on dislocation patterning and stress correlations" Physical Review B Vol. 77 Iss. 174105 (2008) p. 1 - 9
Available at: http://works.bepress.com/richard_lesar/54/