Effect of Directional Crystallization Rate on Microtexture of Al-CuAl2 Eutectic Alloy

Anna Góral 1Jerzy Jura 1Emmanuel Bouzy 2Magdalena M. Bieda 1Lidia Lityńska-Dobrzyńska 1

1. Polish Academy of Sciences, Institute of Metallurgy and Materials Sciences (IMIM PAN), Reymonta 25, Kraków 30-059, Poland
2. Universite de Metz, LETAM, Ile du Saulcy, Cedex1, Metz 57045, France

Abstract

The effect of crystallization rate on the microstructure and the orientation relationship of (Al) and CuAl2 phases in the eutectic alloy was investigated using a step-by-step beam scan on the computer controlled transmission electron microscope.

The microstructure of this alloy changed from the approximately parallel lamellar structure into the eutectic colony structure depending on the rate of the crystallization.

On the basis of the measurement of the individual orientations in the sections perpendicular to the crystallization direction the orientation maps were constructed. The resulting data enabled to link the microstructure development in the analysed alloy to the orientation relationships between (Al) and CuAl2 phases and the preferred orientations.

The dominant orientation relationship identified in all analysed samples was (111) (Al) II (2-11) CuAl2, [-110] (Al) II [120] CuAl2. In the small irregular areas the appearance of another orientation relationships have been found.

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium I, by Anna Góral
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-06-07 11:22
Revised:   2009-06-07 00:44
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