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Synthesis, thermo-mechanical and tribological properties of advanced multicomponent materials of high entropy

Grant number: 19/18460-4
Support type:Regular Research Grants
Duration: January 01, 2020 - September 30, 2022
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Cooperation agreement: CONFAP - National Council of State Research Support Foundations
Principal researcher:Fernando Alvarez
Grantee:Fernando Alvarez
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Assoc. researchers: Alexandre Fassini Michels ; Bruna Louise Perotti ; Carla Daniela Boeira ; Felipe Cemin ; Francisco das Chagas Marques ; Jennifer Stefani Weber ; Leonardo Mathias Leidens ; Mawin Javier Martinez Jimenez ; Nayrim Brizuela Guerra ; Saron Rosy Sales de Mello ; Vinícius Pavinato


The increasing demand for advanced materials combining unique and unusual properties has encouraged the study of new high entropy compounds, such as high entropy alloys (HEA) and ceramics (HEC). The synthesis of these materials was stimulated by the advent of recent computational modeling techniques that consider entropy during material design, which is a fundamental key to explain the stabilization of complex, multicomponent compounds of technological importance. Therefore, the challenge of this proposal focuses on designing and synthetizing high entropy alloys (HEA) at small scales, i.e., as thin and ultrathin films, as well as advancing the fundamental physical knowledge on this new type of materials (scientific goal) and also evaluating the thermo-mechanical and tribological behaviors (technological goal). We expect to achieve these goals by using computational modeling and thermodynamic analysis, followed by the materials synthesis and characterization, understanding of the physical fundaments leading to the desired final properties and the measurement of friction coefficients of tribological systems. The use of plasma spectroscopy in real time during the synthesis of the HEA samples will allow us to control the precursors of the films looking for gaining understanding on the physical fundaments involved in the film growth. In addition to the tribological properties, studies of thermo-mechanical properties will be carried out. We will investigate the mechanical stress as a function of temperature, coefficient of thermal expansion, Young's modulus and Poisson's ratio using methodology developed in our laboratories. These properties are important for applications in device manufacturing. (AU)

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Scientific publications (8)
(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)
SCOCA, DIEGO L. S.; CEMIN, FELIPE; BILMES, SARA A.; FIGUEROA, CARLOS A.; ZANATTA, ANTONIO R.; ALVAREZ, FERNANDO. Role of Rare Earth Elements and Entropy on the Anatase-To-Rutile Phase Transformation of TiO2 Thin Films Deposited by Ion Beam Sputtering. ACS OMEGA, v. 5, n. 43, p. 28027-28036, . (12/10127-5, 18/24461-0, 19/18460-4)
CEMIN, FELIPE; JIMENEZ, MAWIN J. M.; LEIDENS, LEONARDO M.; FIGUEROA, CARLOS A.; ALVAREZ, FERNANDO. A thermodynamic study on phase formation and thermal stability of AlSiTaTiZr high -entropy alloy thin films. Journal of Alloys and Compounds, v. 838, . (19/18460-4, 18/24461-0)
GAAL, GABRIEL; JIMENEZ, MAWIN J. M.; ALVAREZ, FERNANDO; RODRIGUES, VARLEI; RIUL JR, ANTONIO. Influence of water on electrical and mechanical properties of self-assembled and self-healing PEM films. Progress in Organic Coatings, v. 150, . (19/18460-4, 17/19862-3)
ZANATTA, A. R.; ECHEVERRIGARAY, F. G.; CEMIN, F.; ALVAREZ, F.. radual and selective achievement of Rutile-TiO2 by thermal annealing amorphous TixOyNz film. Journal of Non-Crystalline Solids, v. 579, . (18/24461-0, 19/00757-0, 19/18460-4)
LEIDENS, LEONARDO M.; MAIA DA COSTA, MARCELO E. H.; FIGUEROA, NEILETH S.; BARBIERI, RODRIGO A.; ALVAREZ, FERNANDO; MICHELS, ALEXANDRE F.; FIGUEROA, CARLOS A.. On the physicochemical origin of nanoscale friction: the polarizability and electronegativity relationship tailoring nanotribology. Physical Chemistry Chemical Physics, v. 23, n. 4, p. 2873-2884, . (19/18460-4)
CEMIN, FELIPE; DE MELLO, SARON R. S.; FIGUEROA, CARLOS A.; ALVAREZ, FERNANDO. Influence of substrate bias and temperature on the crystallization of metallic NbTaTiVZr high-entropy alloy thin films. SURFACE & COATINGS TECHNOLOGY, v. 421, . (18/24461-0, 19/18460-4)
ZANATTA, A. R.; CEMIN, F.; ECHEVERRIGARAY, F. G.; ALVAREZ, F.. On the relationship between the Raman scattering features and the Ti-related chemical states of TixOyNz films. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 14, p. 864-870, . (19/18460-4, 18/24461-0, 19/00757-0)
ECHEVERRIGARAY, F. G.; ZANATTA, A. R.; ALVAREZ, F.. Reducible oxide and allotropic transition induced by hydrogen annealing: synthesis routes of TiO2 thin films to tailor optical response. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 12, p. 1623-1637, . (19/18460-4, 19/00757-0)

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