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Type: Artigo
Title: Crystallographic features of the Al3Nb, Nb2Al and Nb(Ni-1 (-) Al-x(x))(2) phases in a directionally solidified ternary eutectic microstructure
Author: Lopes, Eder S. N.
Dal Bo, Mariana R.
Opini, Victor C.
de Mello, Mariana G.
Rios, Carlos T.
Fraser, Hamish L.
Caram, Rubens
Abstract: Under directional growth, the eutectic transformation L reversible arrow Al3Nb + Nb2Al + Nb(Ni(1-x)Alx)(2) resulted in a very organized three phase microstructure. While many features of this eutectic have already been explored, crystal-lographic details of its phases are still missing. This paper aims to investigate composition and crystallographic features of a directionally solidified eutectic made up of the Al3Nb, Nb2Al and Nb(Ni1-xAlx)(2) phases. It was observed that the Nb(Ni1-xAlx)(2) intermetallic phase has the C14 structure, with composition 56.91 +/- 0.43 at.% Al, 10.11 +/- 0.12 at.% Ni and 32.98 +/- 0.53 at.% Nb. Selected area diffraction in a transmission electron microscope permitted interplanar spacings to be determined and values obtained are consistent with those in the literature. Accurate lattice parameters were determined using powder X-ray diffraction combined with Rietveld refinement. It was found that the lattice parameters of the Nb(Ni1-xAlx)(2) (x = 0.85) phase are a = 5.031 angstrom and c = 8.298 angstrom and these lattice parameters depend on Al content
Subject: Refinamento Rietveld
Country: Estados Unidos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.matchar.2018.10.030
Date Issue: 2019
Appears in Collections:FEM - Artigos e Outros Documentos

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