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Type: Artigo de periódico
Title: Growth and microstructure evolution of the Nb(2)A-Al3Nb eutectic in situ composite
Author: Rios, CT
Ferrandini, PL
Milenkovic, S
Caram, R
Abstract: In situ composite materials obtained by directional growth of eutectic alloys usually show improved properties, that make them potential candidates for high temperature applications. The eutectic alloy found in the Al-Nb system is composed of the two intermetallic phases Al3Nb (D0(22)) and Nb2Al (D(8)b). This paper describes the directional solidification of an Al-Nb eutectic alloy using a Bridgman type facility at growth rates varying from 1.0 to 2.9 cm/h. Longitudinal and transverse sections of grown samples were characterized regarding the solidification microstructure by using optical and scanning electron microscopy, energy dispersive spectroscopy (EDS) and X-ray diffraction. Despite both phases being intermetallic compounds, the eutectic microstructure obtained was very regular. The results obtained were discussed regarding the effect of the growth rate on the microstructure, lamellar-rod transition and variation of phase volume fraction. (c) 2004 Elsevier Inc. All rights reserved.
Subject: composites
intermetallic compounds
crystal growth
electron microscopy
Country: EUA
Editor: Elsevier Science Inc
Citation: Materials Characterization. Elsevier Science Inc, v. 54, n. 3, n. 187, n. 193, 2005.
Rights: fechado
Identifier DOI: 10.1016/j.matchar.2004.08.017
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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