Structural transformation from the AlCuFe icosahedral phase to the 1/1 cubic (AlSi)CuFe approximant phase; three dimensional models of translation defects

Lann, A. Le; Devaud, J.

doi:10.1007/pl00011038

Cited by 1 publication

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“…The latter is a series of periodic structures consisting of local atomic arrangements similar to the corresponding quasicrystal, and is related to the rational approximation of irrational numbers such as the golden ratio [2]. In particular, defects formed in approximants are thought to provide important hints for understanding structural relationships [3]. For a cubic approximant formed in Al-based alloy, Quiquandon et al analyzed the {110} planar defect [4].…”

Section: Introductionmentioning

confidence: 99%

Planar defect in approximant: the case of Cu-Al-Sc alloy

Ishimasa

Mihalkovič

2021

Philosophical Magazine

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The {110} planar defect formed in the Cu-Al-Sc 1/1 approximant has been studied by means of electron microscopy and 6-dimensional analysis. As the displacement vector of the planar defect, 1 2 τ, τ −1 , 0 has been proposed. Here τ denotes the golden ratio. This vector corresponds to a 6-dimensional translation of type [111000] and also to the c-linkage of Tsai-type clusters. An atomic structure model of the planar defect has been constructed referring to the structural properties of the regular 1/1 approximant; namely truncated triacontahedron framework and embedded clusters. This structural model was validated by the agreement between the observed and simulated HAADF-STEM images. Models of the intersection of two planar defects and the triple point, where three planar defects intersect, were also proposed. All local structures formed at these defects are understood by the concept of so-called canonical cell tiling.

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Section: Introductionmentioning

confidence: 99%