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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Crystallographic features of the Al3Nb, Nb2Al and Nb(Ni-1 (-) Al-x(x))(2) phases in a directionally solidified ternary eutectic microstructure

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Author(s):
Lopes, Eder S. N. [1] ; Dal Bo, Mariana R. [1] ; Opini, Victor C. [1] ; de Mello, Mariana G. [1] ; Rios, Carlos T. [2] ; Fraser, Hamish L. [3] ; Caram, Rubens [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Campinas, Sch Mech Engn, BR-13083860 Campinas, SP - Brazil
[2] Fed Univ ABC, Engn Modeling & Appl Social Sci Ctr, BR-09210580 Santo Andre, SP - Brazil
[3] Ohio State Univ, Dept Mat Sci & Engn, Ctr Accelerated Maturat Mat, 1305 Kinnear Rd, Columbus, OH 43212 - USA
Total Affiliations: 3
Document type: Journal article
Source: MATERIALS CHARACTERIZATION; v. 147, p. 303-310, JAN 2019.
Web of Science Citations: 0
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. (AU)

FAPESP's process: 13/50391-6 - Non-classical mechanisms of solid-state precipitation in Ti alloys
Grantee:Rubens Caram Junior
Support type: Regular Research Grants