Crystal structure of an orthorhombic phase in β-(Al-Fe-Si) precipitates determined by convergent-beam electron diffraction

J. G. Zheng H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, England; Materials Science and Engineering, Department of Engineering, University of Liverpool, Liverpool, L69 3GH, England Phone: +44-151-794-4671 Fax: +44-151-794-4671 E-mail: [email protected]

R. Vincent H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, England

J. W. Steeds H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, England

Abstract

It has been found that the β-(Al-Fe-Si) precipitate with approximate composition Al₅FeSi and lamellar microstructure is not a single-phase compound but a multiphase composite. An orthorhombic phase has been identified from the precipitate and its crystal structure determined by means of convergent-beam electron diffraction. This phase has an orthorhombic A-centred lattice with parameters a = 6.18 Å, b = 6.20 Å and c = 20.8 Å, point group mmm and space group Amam, equivalent to Cmcm (No. 63) in standard notation.

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Crystal structure of an orthorhombic phase in β-(Al-Fe-Si) precipitates determined by convergent-beam electron diffraction

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Crystal structure of an orthorhombic phase in β-(Al-Fe-Si) precipitates determined by convergent-beam electron diffraction

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