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Approximate icosahedral symmetry of α-Al(Fe,Mn,Cr)Si in electron backscatter diffraction analysis of a secondary Al-Si casting alloy

Frequent systematic misindexing of electron backscatter diffraction patterns with five differently oriented pseudosymmetric solutions was observed for the cubic α-Al(Fe,M)Si phase with M = Mn, Cr encountered in secondary Al-Si casting alloy. That misindexing can be ascribed to the close structural relationship of the cubic crystal structure of α-Al(Fe,M)Si to that of the corresponding icosahedral quasicrystal. Robust identification of the correct among the five nearby solutions during automatic indexing can be achieved, which sensitively depends on the accuracy of Kikuchi-band detection applying Hough-space related indexing methods. Based on the correct crystallographic orientation solution, facets of the particles with bulk polyhedral and Chinese script morphology were determined to be {110} planes. Likewise, the habit planes of the α-Al(Fe,M)Si phase particles located at the naturally occurring oxide film are {110} planes.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:86728
Date07 August 2023
CreatorsBecker, Hanka, Leineweber, Andreas
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/acceptedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text
Rightsinfo:eu-repo/semantics/openAccess
Relation1044-5803, 10.1016/j.matchar.2018.05.013

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