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Electron microscopy and diffraction of icosahedral and decagonal quasicrystals in aluminum-manganese alloys

Thangaraj, N and Subbanna, GN and Ranganathan, S and Chattopadhyay, K (1987) Electron microscopy and diffraction of icosahedral and decagonal quasicrystals in aluminum-manganese alloys. In: Journal of Microscopy, 146 (3). pp. 287-302.

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Abstract

Electron microscopy observations on the morphol. of icosahedral and decagonal quasicrystals in Al-Mn alloys were interpreted in favor of a heterogenous nucleation mode. The transition of icosahedral quasicrystals from nonfacetted dendrites to facetted particles occurs as a function of compn. While the variety of electron diffraction patterns expected from icosahedral quasicrystals was demonstrated for a no. of alloys, subtle intensity differences exist among analogous patterns from Al-Mn, Al-Cr, Al-Mn-Si, and Mg-Al-Zn-Cu alloys. Electron diffraction patterns from decagonal quasicrystals are understood on the basis of an edge-centered icosahedral as opposed to a vertex-centered icosahedron for icosahedral quasicrystals. Truncation from 2-dimensional quasicrystals is discussed.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley & Sons.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Jul 2008
Last Modified: 27 Aug 2008 13:29
URI: http://eprints.iisc.ernet.in/id/eprint/14493

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