Kikuchi bands in quasicrystals and their approximants

Gibbons, P. C.; Kelton, K. F.; Ranganathan, S.; Daulton, T. L.

doi:10.1080/01418610008212085

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…To show this more clearly, a stereogram from the cubic phase with the 2-fold, 3-fold, pseudo 2-fold, pseudo 3-fold and pseudo 5-fold axes is shown in figure 6a adjacent to an m 3 5 icosahedral stereogram. Indeed, the similarities are striking and are consistent with the phase being an icosahedral ''approximant'' where the structure is built from large ($50 atom) clusters with icosahedral symmetry [26,27]. The nearly parallel 235 and 358 traces are readily observed in the cubic stereogram consistent with the EBSD and CBED patterns.…”

Section: Resultssupporting

confidence: 70%

Crystallographic studies on the iron-containing intermetallic phases in the 319-type aluminium casting alloys

Hwang¹,

Doty²,

Kaufman³

2008

Philosophical Magazine

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The iron-containing intermetallic compounds in type 319 aluminium casting alloys were investigated using convergent beam electron diffraction (CBED) and electron backscatter diffraction (EBSD). The Chinese script -phase was identified as having the cubic Im 3 space group consistent with the Al 19 Fe 4 MnSi 2 phase reported in the literature. However, the atomic ordering of this phase results in complex Kikuchi lines in the CBED and EBSD patterns, which makes phase and orientation identification difficult. In fact, it is shown that the EBSD patterns in the scanning electron microscope and Kikuchi patterns in the transmission electron microscope from this phase are closely related to the structurally similar m 3 5 icosahedral quasicrystals that form in numerous aluminium-transition metal alloys by both conventional and rapid solidification. The other iron-containing phase in these alloys was determined to be plate shaped and to have the orthorhombic Cmcm space group consistent with the -Al 5 FeSi phase, which has sometimes been confused with having a tetragonal or monoclinic structure. The nature of this structure is such that it frequently grows with a high density of faults that separate equivalent variants; these will be described and related to the previously incorrect interpretations of this being a tetragonal phase.

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Section: Resultssupporting

confidence: 70%