Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 57: Complex Materials I

MM 57.5: Talk

Thursday, March 29, 2012, 16:45–17:00, H 1029

Defects in the monoclinic Al-Pd-Fe complex metallic alloy — •Michael Feuerbacher and Marc Heggen — Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

The complex metallic alloy phase m-Al-Pd-Fe, a ternary extension of the Al13Fe4 phase, has a monoclinic structure (space group C1 2/m, lattice constants a = 1.55 nm, b = 0.88 nm, c = 1.25 nm). The unit cell contains 102 atoms, which are coordinated in the form of icosahedral clusters.

We present a characterization of defects in as grown and plastically deformed m-Al-Pd-Fe by means of aberration-corrected high-resolution scanning transmission electron microscopy using a high-angle annular dark-field detector. In the deformed samples we find dislocations trailing stacking faults at a high density, which mediate plastic deformation in the structure. We identify the displacement vectors of the stacking faults and the dislocation Burgers vectors. We demonstrate that the dislocations are metadislocations and discuss their relation to metadislocations in orthorhombic Taylor phases.