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| Hauptseite > Publikationsdatenbank > Metadislocations in the complex metallic alloys T-Al-Mn-(Pd,Fe) |
| Hauptseite > Publikationsdatenbank > Metadislocations in the complex metallic alloys T-Al-Mn-(Pd,Fe) |
| Journal Article | PreJuSER-18706 |
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2011
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.actamat.2011.03.069
Abstract: We investigate dislocations in the complex metallic alloys T-Al-Mn-Pd and T-Al-Mn-Fe using high-resolution aberration-corrected scanning transmission electron microscopy. The dislocations consist of a large core and separated escort defects [1]. Upon movement, dislocations and escort defects locally transform the material and introduce stacks of planar faults which represent a slab of a different but related structure. Deformation modes involving glide and climb are observed. We find different types of dislocations with Burgers vectors (b) over bar = -(-tau)(-n)(0 0 1), with n = 2, 3, 4. They are associated to two, four and six planar faults, respectively, and are identified as metadislocations. The structural connection between metadislocations in the present phase and those in R-, epsilon(6)-, and xi-phases is discussed. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword(s): J ; High-resolution electron microscopy (HREM) (auto) ; Aluminium alloys (auto) ; Dislocation structure (auto) ; Phase transformations (auto)
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