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The Effects of Short‐Range Order and Long‐Range Order on the Equilibrium Configuration of Superdislocations in FeCo : 2 at% V — Consequences on Flow Stress
Author(s) -
Moine P.,
Eymery J. P.,
Grosbras P.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220460115
Subject(s) - flow stress , dislocation , range (aeronautics) , materials science , condensed matter physics , stress (linguistics) , order (exchange) , atmospheric temperature range , flow (mathematics) , thermodynamics , mechanics , physics , composite material , microstructure , linguistics , philosophy , finance , economics
The variations in flow stress of FeCo : 2 at% V as a function of test or quench temperature exhibit a maximum near the critical temperature for ordering, T c . Transmission microscope study of thin foils reveals the existence of paired dislocations not only at temperatures below T c but also at temperatures above T c where only short‐range order exists; calculations of their equilibrium spacing using the quasi‐chemical theory [6] are in agreement with experimental results. The peak in flow stress may be explained assuming that for high values of S ( S is the long‐range order parameter) the dislocation sources are constituted by paired dislocations which keep parallel configurations when operating, and that for low values of S (or S = 0) sources are constituted by single dislocations or by paired dislocations with only one of them operating.