physica status solidi (a)
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)
Online ISSN: 1862-6319
Real-time and in situ solidification of Al-based alloys investigated by synchrotron radiation: a unique experimental set-up combining radiography and topography techniques
This special issue's cover shows a radiograph and a topograph recorded during Al–3.5 wt% Ni alloy solidification. On the radiograph (left), one can observe the development of a branching structure known as dendrite. The high quality of the dendrite in the early stage of the growth is confirmed by the equal-thickness fringes which are visible within the solid in the topograph (middle and right). Those fringes evidence the absence of defects within the microstructure.
The alloy's properties are largely controlled by the microstructure emerging during the growth process. As most of the phenomena involved during directional solidification are dynamic, it is crucial to perform an in situ and real-time investigation. A unique experimental set-up combining X-ray radiography and topography has been recently developed at the ESRF (European Synchrotron Radiation Facility). It allows direct observation of the microstructure during directional solidification .
The first author of the article is a PhD student at the ESRF (Grenoble). Her research focuses on Al-based alloy solidification and more particularly on strains, stresses and defect formation during directional solidification. She is working in collaboration with the L2MP (CNRS, Marseille). (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)