Crystallographic features of the Al3Nb, Nb2Al and Nb(Ni-1 (-) Al-x(x))(2) phases in a directionally solidified ternary eutectic microstructure
Eder S. N. Lopes, Mariana R. Dal Bo, Victor C. Opini, Mariana G. de Mello, Carlos T. Rios, Hamish L. Fraser, Rubens Caram
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the Brazilian research funding agencies FAPESP (São Paulo Research Foundation) (Grant 2013/50391-6) and CNPq (National Council for Scientific and Technological Development) (Grant 209449/2013-6) for its financial support, CBMM Co. for supplying Nb, and the...
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Agradecimentos: The authors acknowledge the Brazilian research funding agencies FAPESP (São Paulo Research Foundation) (Grant 2013/50391-6) and CNPq (National Council for Scientific and Technological Development) (Grant 209449/2013-6) for its financial support, CBMM Co. for supplying Nb, and the Center for Electron Microscopy and Analysis (CEMAS - The Ohio State University) for providing access to the characterization facilities
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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...
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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
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2013/50391-6
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
209449/2013-6
Fechado
Crystallographic features of the Al3Nb, Nb2Al and Nb(Ni-1 (-) Al-x(x))(2) phases in a directionally solidified ternary eutectic microstructure
Eder S. N. Lopes, Mariana R. Dal Bo, Victor C. Opini, Mariana G. de Mello, Carlos T. Rios, Hamish L. Fraser, Rubens Caram
Crystallographic features of the Al3Nb, Nb2Al and Nb(Ni-1 (-) Al-x(x))(2) phases in a directionally solidified ternary eutectic microstructure
Eder S. N. Lopes, Mariana R. Dal Bo, Victor C. Opini, Mariana G. de Mello, Carlos T. Rios, Hamish L. Fraser, Rubens Caram
Fontes
Materials characterization (Fonte avulsa) |