Abstract
Abstract Type B dislocations with Burgers vectors parallel to the twofold axes of the Al70Co15Ni15 decagonal quasicrystal were studied by means of electron diffraction contrast imaging and defocus convergent-beam electron diffraction techniques. Two kinds of Burgers vector of the type B dislocations were determined, both being parallel to a twofold axis A2P of the decagonal quasicrystal. The components |b∥| of the Burgers vector b = 〈00 1 0 [sbnd] 1 0〉 in physical space and the component |bperp| of the Burgers vector in complementary space are 0.186 and 0:115 nm respectively, with a ratio T of 1.618. The components for b = 〈0 1 0 [sbnd]11〉 are 0.302 and 0.071 nm with a ratio τ3 of 4.235.
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