Atomic model of dislocations in Al-Pd-Mn icosahedral quasicrystals
Atomic model of dislocations in Al-Pd-Mn icosahedral quasicrystals
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DOI：
10.1080/01418619808214265
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发表时间：
1998-06
影响因子：
1.6
通讯作者：
Wenge Yang;M. Feuerbacher;N. Tamura;D. Ding;Renhui Wang;K. Urban
中科院分区：
文献类型：
--
作者：
Wenge Yang;M. Feuerbacher;N. Tamura;D. Ding;Renhui Wang;K. Urban
Abstract Using the Green's function and eigenstrain method, we derived an analytical expression for the elastic displacement fields induced by a dislocation in an icosahedral quasicrystal. In this paper, we calculate the special case where the line direction of the dislocation is parallel to a fivefold axis. Combining this expression with a structure model of icosahedral Al-Pd-Mn (the model of Boudard et al.) the atomic structure of straight dislocations was calculated and the corresponding high-resolution electron microscopy images were simulated. These are the first simulations of dislocations in an icosahedral quasicrystal using a realistic structure model. As an example, series of images of dislocations are presented with different twofold Burgers vectors of type |b⊥|/|b∥| = τ3 and |b⊥|/|b∥| = τ7 respectively, which were both observed experimentally. An analysis of the fringe patterns, obtained by inverse Fourier transformation of the simulated images is presented.
