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Dislocation identification and in situ straining in the spinodal Fe 30 Ni 20 Mn 25 Al 25 alloy
Author(s) -
Loudis J.A.,
Baker I.
Publication year - 2008
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.20576
Subject(s) - spinodal , alloy , materials science , dislocation , spinodal decomposition , in situ , crystallography , metallurgy , condensed matter physics , microstructure , analytical chemistry (journal) , chemistry , phase (matter) , composite material , physics , chromatography , organic chemistry
Dislocations in the spinodal alloy Fe 30 Ni 20 Mn 25 Al 25 , which is composed of alternating BCC and B2 (ordered BCC) phases, have been investigated using weak‐beam transmission electron microscopy (TEM). The alloy was compressed at room temperature in an as‐hot‐extruded state to strains of ∼3% for post‐mortem dislocation analysis. Dislocations with a/2〈111〉 Burgers vectors were found to glide in pairs on both {110} and {112} slip planes. TEM in situ straining experiments were also performed on both the as‐extruded alloy and an arc‐melted alloy. The in situ straining observations confirmed that dislocations were able to pass between both spinodal phases. Partial dislocation separations were relatively wide in the BCC phase and narrow in the B2 phase. Dislocation glide, as opposed to twinning (both of which have been observed in other BCC‐based spinodals), was also found to be the only room temperature deformation mechanism. Microsc. Res. Tech., 2008. © 2008 Wiley‐Liss, Inc.