Author:

Keywords:

quasi-crystals, burgers vector, dislocations, diffraction, Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Physics, Applied, Physics, Condensed Matter, Materials Science, Physics, QUASI-CRYSTALS, BURGERS VECTOR, DISLOCATIONS, DIFFRACTION, 0204 Condensed Matter Physics, 0912 Materials Engineering, 0913 Mechanical Engineering, Materials, 4016 Materials engineering, 4017 Mechanical engineering, 5104 Condensed matter physics

Abstract:

Al-Pd-Mn single-quasicrystals have been plastically deformed at temperatures between 730 and 800 degrees C up to different strain values and analysed in the transmission electron microscope. Dislocations were created during deformation. The dislocation density ranged between 1.7 x 10(7) cm(-2) in undeformed samples and 7.8 x 10(8) cm(-2) in material deformed at 732 degrees C. Six-dimensional dislocation Burgers vectors were determined employing the convergent-beam electron diffraction technique. 87% of these Burgers vectors were oriented parallel to twofold directions in three-dimensional physical space. Their moduli were 0.113, 0.183 and 0.296 nm. The ratio of the phason to the phonon component of the Burgers vectors was found to increase with increasing strain. A variety of slip systems was observed. In most cases the respective slip plane normals were parallel to fivefold and threefold directions.