Departmental Papers (MSE)
Document Type
Journal Article
Date of this Version
February 2007
Abstract
We propose a mesoscopic model that explains the factor of two to three discrepancy between experimentally measured yield stresses of BCC metals at low temperatures and typical Peierls stresses determined by atomistic simulations of isolated screw dislocations. The model involves a Frank-Read type source emitting dislocations that become pure screws at a certain distance from the source and, owing to their high Peierls stress, control its operation. However, due to the mutual interaction between emitted dislocations the group consisting of both non-screw and screw dislocations can move at an applied stress that is about a factor of two to three lower than the stress needed for the glide of individual screw dislocations.
Keywords
peierls stress, screw dislocations, mixed dislocations, interactions, Frank-Read sources
Recommended Citation
Vitek, V., & Groger, R. (2007). Explanation of the discrepancy between the measured and atomistically calculated yield stresses in body-centered cubic metals. Retrieved from https://repository.upenn.edu/mse_papers/125
Date Posted: 30 March 2007
This document has been peer reviewed.
Comments
Postprint version. Published in Philosophical Magazine Letters, Volume 87, Issue 2, February 2007, pages 113-120.
Publisher URL: http://dx.doi.org/10.1080/09500830601158781