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X-Ray Monitoring of Solidification Phenomena in Al-Cu Alloys

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Abstract:

In-situ synchrotron X-ray radiography has been used to study columnar and equiaxed dendritic growth in directional solidification of Al-Cu alloys employing a Bridgman furnace. Nominal spatial and temporal resolutions of 1.5 µm and 150 ms, respectively, were obtained with a 1.3 %1.3 mm2 field of view, and a signal-to-noise above 99.5 %. Dedicated processing software has been developed to allow for quantitative extraction of data such as solid-liquid interface morphology, local propagation velocities and constitutional gradients from the images. The data collected also contain unprecedented in-situ observations on dendrite fragmentation. The limited field of view together with a slight sample position dependency in the heat transfer coefficients made it necessary to impose thermal gradients, G > 10 K/mm, to have reproducible solidification processes. Non-vanishing horizontal G-components contributed to convection that at some occasions resulted in observable effects on growing crystals or on liquid segregates.

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Periodical:

Materials Science Forum (Volume 508)

Pages:

69-74

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.508.69

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Online since:

March 2006

Authors:

Ragnvald H. Mathiesen, Lars Arnberg

Keywords:

Aluminium Alloy, Constitutional Undercooling, Dendrite Fragmentation, Dendritic Growth, Directional Solidification, Synchrotron Radiation (XRD)

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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