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Type: Artigo de periódico
Title: Investigation of intermetallics in hypoeutectic Al-Fe alloys by dissolution of the Al matrix
Author: Goulart, PR
Lazarine, VB
Leal, CV
Spinelli, JE
Cheung, N
Garcia, A
Abstract: During the non-equilibrium solidification typical of DC (direct chill) castings a range of cooling rates occur from the surface to the casting center, and can cause the formation of metastable intermetallic phases (Al(m)Fe, Al(6)Fe, etc.) in addition to the stable Al(3)Fe phase. The extensive presence of the plate-like Al3Fe phase in the as-cast structure adversely influences the mechanical properties of Al-Fe alloys, since this morphology is more likely to induce microcracks than the fibrous Al(6)Fe phase. The aim of this study was to present a method of characterization of AlFe intermetallics which is based on the dissolution of the aluminum matrix in distilled I-butanol. Optical microscopy and SEM analysis of the undissolved intermetallics have permitted characterization of the morphology, distribution, size and chemical composition of both Al(3)Fe and Al(6)Fe phases. The results have shown that Al(6)Fe prevails for growth rates V(L) and cooling rates (T) over dot(L) higher than 0.7 mm/s and 1.5 K/s, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
Subject: Iron aluminides (based on FeAl)
Phase identification
Metallographic techniques
Country: Inglaterra
Editor: Elsevier Sci Ltd
Rights: fechado
Identifier DOI: 10.1016/j.intermet.2009.03.003
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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