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Experimental investigation and thermodynamic modeling of the Al-Nb-V system

Grant number: 18/13966-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2018
Effective date (End): September 30, 2022
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal researcher:Gilberto Carvalho Coelho
Grantee:Júlio César Pereira dos Santos
Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
Associated scholarship(s):19/27583-2 - Experimental investigation and thermodynamic modelling of the Al-Nb-V system, BE.EP.DR

Abstract

Since the beginning of the 21st century, a new concept for the development of metallic alloys has attracted the interest of the scientific community. These are alloys with no major chemical element, ie alloys with multi-principal elements, which are known as high entropy alloys. Aiming at high temperature applications, refractory metals have been used as constituents of such alloys, giving rise to refractory high entropy alloys. Later, aluminum was added to refractory high entropy alloys with the objective of reducing their specific mass - a critical alloy design parameter in the aerospace industry. A study of the phase equilibrium relations involving refractory metals and aluminum is therefore necessary, given the chemical differences between the elements. In this context one of the systems of interest is the ternary Al-Nb-V, which has been little studied so far. The PhD-schoolarship candidate, MSc Júlio César Pereira dos Santos, has already started the studies in this system in his master work, determining the isothermal section at 1200°C and performing a thermodynamic preliminary modeling of the system using microstructural characterization results of heat treated samples. From the studies carried out and the discussions about the results of his master work, it was observed the need to continue investigating the Al-Nb-V system. Therefore, the liquidus projection and the isothermal section at 1000°C of the Al-Nb-V system are proposed to be studied in this project, in addition to the continuation of the thermodynamic modeling. Samples will be produced by arc-melting mixtures of the pure elemens and most of them will be annealled at 1000°C for at least 20 days. All as-cast as well as annealed samples will be microstructurally characterized by means of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and electron microanalysis (EDS/WDS). The experimental results will be used as input for the thermodynamic optimization process. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PEREIRA DOS SANTOS, JULIO CESAR; ARAUJO PINTO DA SILVA, ANTONIO AUGUSTO; FERREIRA, PEDRO PIRES; DORINI, THIAGO TREVIZAM; DE BARROS, DENIS FELIPE; DE ABREU, DANILO ALENCAR; FERNANDES ELENO, LUIZ TADEU; NUNES, CARLOS ANGELO; COELHO, GILBERTO CARVALHO. Thermodynamic modeling of the Al-Nb-V system. CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, v. 74, SEP 2021. Web of Science Citations: 0.
SANTOS, J. C. P.; CHAIA, N.; BOROWSKI, K. E.; DA SILVA, A. A. A. P.; BARROS, D. F.; ABREU, D. A.; NUNES, C. A.; COELHO, G. C. Liquidus projection of the Al-Nb-V system. CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, v. 71, DEC 2020. Web of Science Citations: 0.
SANTOS, J. C. P.; CHAIA, N.; BOROWSKI, K. E.; SILVA, A. A. A. P.; BARROS, D. F.; ABREU, D. A.; NUNES, C. A.; COELHO, G. C. Experimental Investigation of Phase Equilibria at 1200 degrees C in the Al-Nb-V System. JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, v. 41, n. 2 APR 2020. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.