Document Type
Article
Publication Date
5-6-2008
Journal or Book Title
Physical Review B
Volume
77
Issue
174105
First Page
1
Last Page
9
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.
Copyright Owner
The American Physical Society
Copyright Date
2008
Language
en
File Format
application/pdf
Recommended Citation
Rickman, J. M.; Haatja, M.; and Lesar, Richard Alan, "Impact of obstacles on dislocation patterning and stress correlations" (2008). Materials Science and Engineering Publications. 153.
https://lib.dr.iastate.edu/mse_pubs/153
Comments
This article is from Physical Review B 77 (2008): 1, doi:10.1103/PhysRevB.77.174105. Posted with permission.