A transmission electron microscopic study of icosahedral twins- II. A rapidly solidified Al-Cu-Fe alloy

Singh, Alok and Ranganathan, S (1995) A transmission electron microscopic study of icosahedral twins- II. A rapidly solidified Al-Cu-Fe alloy. In: Acta Metallurgica et Materialia, 43 (9). pp. 3553-3562.

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Abstract

Twinning of the ordered icosahedral quasicrystal has been studied by transmission electron microscopy in a melt-spun $Al_{75} Cu_{12.5} Fe_{12.5}$ alloy. Dendrites of about $10 \mu m$ of the icosahedral phase, formed near the wheel side of the melt spun ribbons, have been observed to twin extensively so that a multiple twinning of the grains is observed. Regions of about $1 \mu m$ size are twin related through a common five-fold axis to several neighbouring regions. The possibility of different orientations of the twins formed by repeated twinning is infinite. Thus the multiple twinning gives rise to a random symmetry for the whole grain. Depending on the undercooling achieved across the melt-spun ribbons, several related phases like the decagonal quasicrystal and crystalline monoclinic $Al_3Fe$ phase in ten-fold multiply twinned form were also observed.

Item Type:	Journal Article
Publication:	Acta Metallurgica et Materialia
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	18 Sep 2006
Last Modified:	19 Sep 2010 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/8629

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