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

Singh, Alok ; Ranganathan, S. (1995) A transmission electron microscopic study of icosahedral twins-II. A rapidly solidified Al-Cu-Fe alloy Acta Metallurgica et Materialia, 43 (9). pp. 3553-3562. ISSN 0956-7151

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/095671...

Related URL: http://dx.doi.org/10.1016/0956-7151(95)00025-Q

Abstract

Twinning of the ordered icosahedral quasicrystal has been studied by transmission electron microscopy in a melt-spun Al75Cu12.5Fe12.5 alloy. Dendrites of about 10µm 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 µm 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 Al3Fe phase in ten-fold multiply twinned form were also observed.

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