In-Situ and Real-Time Investigation of Columnar-to-Equiaxed Transition in Metallic Alloy |
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Authors: | H Nguyen-Thi G Reinhart N Mangelinck-Noël H Jung B Billia T Schenk J Gastaldi J Härtwig J Baruchel |
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Affiliation: | (1) L2MP, UMR 6137, UniversitéPaul Cézanne - Aix-Marseille III, 13397 Marseille Cedex 20, France;(2) Laboratoire de Physique des Matériaux, Ecole des Mines de Nancy, 54042 Nancy Cedex, France;(3) CRMCN, 13288 Marseille Cedex 9, France;(4) ESRF, BP 220, 38043 Grenoble, France |
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Abstract: | In this article, we present a review of observations during Al-3.5 wt pct Ni alloy solidi.cation experiments performed at
the European Synchrotron Radiation Facility (ESRF) in Grenoble. These experiments provide direct access to dynamical phenomena
during columnar growth (initial transient and breakdown of a planar solid-liquid interface), and for the first time to the
transition from columnar-to-equiaxed microstructure (nucleation ahead of a columnar front and blocking of a columnar front
by an equiaxed microstructure) and fully equiaxed growth (propagation of an effective front). Based on these experimental
observations, critical parameters such as columnar growth velocity variation during the transition or equiaxed-grain diameter
are measured and discussed.
This article is based on a presentation made in the symposium entitled “Solidi.cation Modeling and Microstructure Formation:
In Honor of Prof. John Hunt,” which occurred March 13–15, 2006, during the TMS Spring Meeting in San Antonio, Texas, under
the auspices of the TMS Materials Processing and Manufacturing Division, Solidification Committee. |
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