Nb-Al binary system: Reevaluation of the solubility limits of the (Nb), Nb3Al, Nb2Al and NbAl 3 phases at high temperatures

Antonio Augusto Araujo Pinto Da Silva; Gilberto Carvalho Coelho; Carlos Angelo Nunes; Jean Marc Fiorani; Nicolas David; Michel Vilasi

doi:10.1590/1980-5373-MR-2019-0305

Nb-Al binary system: Reevaluation of the solubility limits of the (Nb), Nb₃Al, Nb₂Al and NbAl ₃ phases at high temperatures

Antonio Augusto Araujo Pinto Da Silva, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Jean Marc Fiorani, Nicolas David, Michel Vilasi

Research output: Contribution to journal › Article › peer-review

Abstract

In this work a re-investigation of the solubility limits of the (Nb), Nb₃Al, Nb₂Al and the Nb-rich side of the NbAl ₃ phases on the Nb-Al system is presented. Alloys in the binary felds ((Nb)+Nb₃Al, Nb ₃Al+Nb₂Al and Nb₂Al+NbAl₃) were arc-melted, and then equilibrated at 1000, 1200 and 1400 °C. The phases were confrmed via X-ray powder diffractometry, and their compositions were determined via EPMA measurements. The results showed agreement with the literature concerning the solubility limits of (Nb), Nb₃Al and NbAl₃ phases, while important differences in the values were found for the Nb ₂Al phase. In addition, the lattice parameters of the Nb₂Al phase were determined via Rietveld refnement. This new set of more accurate experimental information indicates that a thermodynamic reassessment is necessary to precisely describe this system.

Original language	English
Article number	e20190305
Journal	Materials Research
Volume	22
Issue number	5
DOIs	https://doi.org/10.1590/1980-5373-MR-2019-0305
Publication status	Published - 1 Jan 2019
Externally published	Yes

Keywords

Intermetallics
Nb-Al system
Phase diagrams

Access to Document

10.1590/1980-5373-MR-2019-0305

Cite this

@article{f5694df7fe2848dc83d3e9a4f45371ff,

title = "Nb-Al binary system: Reevaluation of the solubility limits of the (Nb), Nb3Al, Nb2Al and NbAl 3 phases at high temperatures",

abstract = "In this work a re-investigation of the solubility limits of the (Nb), Nb3Al, Nb2Al and the Nb-rich side of the NbAl 3 phases on the Nb-Al system is presented. Alloys in the binary felds ((Nb)+Nb3Al, Nb 3Al+Nb2Al and Nb2Al+NbAl3) were arc-melted, and then equilibrated at 1000, 1200 and 1400 °C. The phases were confrmed via X-ray powder diffractometry, and their compositions were determined via EPMA measurements. The results showed agreement with the literature concerning the solubility limits of (Nb), Nb3Al and NbAl3 phases, while important differences in the values were found for the Nb 2Al phase. In addition, the lattice parameters of the Nb2Al phase were determined via Rietveld refnement. This new set of more accurate experimental information indicates that a thermodynamic reassessment is necessary to precisely describe this system.",

keywords = "Intermetallics, Nb-Al system, Phase diagrams",

author = "\{Da Silva\}, \{Antonio Augusto Araujo Pinto\} and Coelho, \{Gilberto Carvalho\} and Nunes, \{Carlos Angelo\} and Fiorani, \{Jean Marc\} and Nicolas David and Michel Vilasi",

year = "2019",

month = jan,

day = "1",

doi = "10.1590/1980-5373-MR-2019-0305",

language = "English",

volume = "22",

journal = "Materials Research",

issn = "1516-1439",

number = "5",

}

TY - JOUR

T1 - Nb-Al binary system

T2 - Reevaluation of the solubility limits of the (Nb), Nb3Al, Nb2Al and NbAl 3 phases at high temperatures

AU - Da Silva, Antonio Augusto Araujo Pinto

AU - Coelho, Gilberto Carvalho

AU - Nunes, Carlos Angelo

AU - Fiorani, Jean Marc

AU - David, Nicolas

AU - Vilasi, Michel

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In this work a re-investigation of the solubility limits of the (Nb), Nb3Al, Nb2Al and the Nb-rich side of the NbAl 3 phases on the Nb-Al system is presented. Alloys in the binary felds ((Nb)+Nb3Al, Nb 3Al+Nb2Al and Nb2Al+NbAl3) were arc-melted, and then equilibrated at 1000, 1200 and 1400 °C. The phases were confrmed via X-ray powder diffractometry, and their compositions were determined via EPMA measurements. The results showed agreement with the literature concerning the solubility limits of (Nb), Nb3Al and NbAl3 phases, while important differences in the values were found for the Nb 2Al phase. In addition, the lattice parameters of the Nb2Al phase were determined via Rietveld refnement. This new set of more accurate experimental information indicates that a thermodynamic reassessment is necessary to precisely describe this system.

AB - In this work a re-investigation of the solubility limits of the (Nb), Nb3Al, Nb2Al and the Nb-rich side of the NbAl 3 phases on the Nb-Al system is presented. Alloys in the binary felds ((Nb)+Nb3Al, Nb 3Al+Nb2Al and Nb2Al+NbAl3) were arc-melted, and then equilibrated at 1000, 1200 and 1400 °C. The phases were confrmed via X-ray powder diffractometry, and their compositions were determined via EPMA measurements. The results showed agreement with the literature concerning the solubility limits of (Nb), Nb3Al and NbAl3 phases, while important differences in the values were found for the Nb 2Al phase. In addition, the lattice parameters of the Nb2Al phase were determined via Rietveld refnement. This new set of more accurate experimental information indicates that a thermodynamic reassessment is necessary to precisely describe this system.

KW - Intermetallics

KW - Nb-Al system

KW - Phase diagrams

U2 - 10.1590/1980-5373-MR-2019-0305

DO - 10.1590/1980-5373-MR-2019-0305

M3 - Article

AN - SCOPUS:85076359129

SN - 1516-1439

VL - 22

JO - Materials Research

JF - Materials Research

IS - 5

M1 - e20190305