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Berlin 2005 – scientific programme

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M: Metallphysik

M 11: Symposium Complex Metallic Alloys III

M 11.4: Talk

Friday, March 4, 2005, 18:15–18:30, TU H1058

Structural defects in orthorhombic Al13Co4 — •Dewei Deng, Marc Heggen, and Michael Feuerbacher — Institut für Festkörperforschung Forschungszentrum Jülich GmbH
Orthorhombic Al13Co4 is a complex metallic alloy phase with 101 atoms per unit cell. The lattice constants are a = 0.8165(1)nm, b = 1.2352(1)nm, c = 1.4451(1)nm and it has a of Pmn21 space group. It is structurally isomorphic to the well investigated phase ξ ’-Al-Pd-Mn in the sense that the [1 0 0] lattice direction of orthorhombic Al13Co4 can be described using similar types of hexagon-tiling arrangements as for the [0 1 0] direction of ξ ’-Al-Pd-Mn. We have grown single crystals of orthorhombic Al13Co4 using the Bridgman technique. In the as grown material defect analyses were performed by means of transmission electron microscopy.
The material contains planar defects terminated by dislocations. The planar defects were identified as stacking faults. By means of tilting series in the transmission electron microscope the plane normal of the faults was determined as parallel to the [0 0 1] lattice direction. We have performed two beam Bragg-contrast exit nction experiments and determined the strain-field direction of the planar faults and the terminating dislocations as parallel to the [3 2 0] direction. Hence we can conclude that partial-dislocation motion on (0 0 1) lattice planes by pure glide takes place in orthorhombic Al13Co4

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