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Dislocations in nanostructured two‐phase Fe 30 Ni 20 Mn 20 Al 30
Author(s) -
Wu X.,
Baker I.
Publication year - 2013
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22162
Subject(s) - materials science , slip (aerodynamics) , crystallography , phase (matter) , burgers vector , phase boundary , single phase , condensed matter physics , dislocation , composite material , chemistry , thermodynamics , physics , engineering , electrical engineering , organic chemistry
In a previous study, the dislocations in Fe 30 Ni 20 Mn 25 Al 25 (at. %), which consist of 50 nm wide alternating b.c.c. and B2 phases, were shown to have a/2<111> Burgers vectors after room temperature deformation. The dislocations were found to glide in pairs on both {110} and {112} slip planes and were relatively widely separated in the b.c.c. phase, where the dislocations were uncoupled, and closely spaced in the B2 phase, where the dislocations were connected by an anti‐phase boundary. In this article, we analyze the dislocations in the two ∼5 nm‐wide B2 phases in a related two‐phase alloy Fe 30 Ni 20 Mn 20 Al 30 , with compositions Fe‐23Ni‐21Mn‐24Al and Fe‐39Ni‐12Mn‐34Al, compressed to ∼3% strain at a strain rate 5 × 10 −4 s −1 at 873 K (the lowest temperature at which substantial plastic flow was observed). It is shown that slip occursby the glide of a <100> dislocations. A review of the literature suggests that the differences in the observed slip vector between these B2 phases could be due to the differences in composition, differences in deformation temperature, or possibly both. Microsc. Res. Tech. 76:263–267, 2013 . © 2013 Wiley Periodicals, Inc.