Physics – Condensed Matter – Materials Science
Scientific paper
2006-05-18
Phil. Mag. Letters 87, 113-120 (2007)
Physics
Condensed Matter
Materials Science
4 pages, 2 figures; RevTex4; submitted to PRL
Scientific paper
10.1080/09500830601158781
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.
Gröger Roman
Vitek Vojtěch
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