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Dislocation densities and prevailing slip‐system types determined by X‐ray line profile analysis in a textured AZ31 magnesium alloy deformed at different temperatures
Author(s) -
Jóni Bertalan,
AlSamman Talal,
Chowdhury Sandip Ghosh,
Csiszár Gábor,
Ungár Tamás
Publication year - 2013
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/s0021889812046705
Subject(s) - materials science , diffractometer , slip (aerodynamics) , dislocation , texture (cosmology) , diffraction , ultimate tensile strength , alloy , crystallography , magnesium , deformation (meteorology) , composite material , metallurgy , optics , chemistry , physics , thermodynamics , image (mathematics) , scanning electron microscope , artificial intelligence , computer science
Tension experiments were carried out at room temperature, 473 K and 673 K on AZ31‐type extruded magnesium alloy samples. The tensile deformation has almost no effect on the typical extrusion texture at any of the investigated temperatures. X‐ray diffraction patterns provided by a high‐angular‐resolution diffractometer were analyzed for the dislocation density and slip activity after deformation to fracture. The diffraction peaks were sorted into two groups corresponding either to the major or to the random texture components in the specimen. The two groups of reflections were evaluated simultaneously as if the two texture components were two different phases. The dislocation densities in the major texture components are found to be always larger than those in the randomly oriented grain populations. The overwhelming fraction of dislocations prevailing in the samples is found to be of 〈 a 〉 type, with a smaller fraction of 〈 c + a 〉‐type dislocations. The fraction of 〈 c 〉‐type dislocations is always obtained to be zero within experimental error.