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Orientation relationship between Al 6 Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn
Author(s) -
Yang Ping,
Engler Olaf,
Klaar HansJoachim
Publication year - 1999
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889899010870
Subject(s) - misorientation , materials science , crystallography , transmission electron microscopy , microstructure , annealing (glass) , recrystallization (geology) , diffraction , electron diffraction , lattice (music) , precipitation , dislocation , condensed matter physics , metallurgy , grain boundary , composite material , chemistry , optics , geology , nanotechnology , physics , paleontology , meteorology , acoustics
Annealing of cold‐rolled supersaturated Al–1.3 wt% Mn leads to heavy precipitation of fine particles on the as‐deformed microstructure. Depending on the crystallographic orientation of the deformed matrix grains, particles with different morphologies, namely spherical, rhomboidal and plate‐like, have been observed. This variation in morphology could be traced back to differences in local misorientation caused by different dislocation substructures in different matrix orientations. Microstructural investigations and selected‐area diffraction (SAD) analysis in a transmission electron microscopy (TEM) study were employed to characterize the various particles and to determine their orientation relationship to the Al matrix. Independent of the particle morphology, most Mn precipitates were identified as Al 6 Mn; only occasionally was Al 12 Mn observed. Upon consideration of the various crystal symmetries, two different orientation relationships were discerned, which can be written as (110) m ||(111) p , [001] m ||[2¯11] p and (110) m ||(111) p , [11¯2] m ||[12¯1] p . These orientation relationships are discussed with respect to the existence of several low misfits of lattice spacings and compared to literature data.