This article is cited in 4 papers

Metals

Planar defects in the icosahedral phase in quasicrystal-forming AlCuFe alloys

E. V. Shalaeva^a, A. F. Prekul^b, S. Z. Nazarova^a, V. V. Khiller<sup>c

a</sup> Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg
^b Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^c Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, 620151, Russia

Abstract: Electron microscopy has revealed that, upon the formation of a stable icosahedral $(\iota)$ AlCuFe phase, there arise a large number of planar defects. The revealed defects are nanometer-sized coherent intergrowths of the $P$1-pentagonal approximant. It has been found that the formation of these defects is the result of a nonequilibrium intermediate transformation. The intergrowths are located in the planes with the fivefold symmetry axis and give rise to an elastic-strain state of the $\iota$-phase. Analysis of the diffraction contrast has revealed the presence of phason and phonon atomic displacements due to the mismatch between the quasiperiodic ($\iota$-phase) and periodic ($P$1-phase) lattices. The formed structure exhibits a higher electrical resistance as compared to the $\iota$-phase and has been considered as a model state of the imperfect icosahedral phase with preferred phonon displacements.

Received: 27.09.2011

 English version: Physics of the Solid State, 2012, 54:4, 699–707

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