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Multicomponent metallic alloys for applications in corrosion and wear resistant coatings


The research project has its focus in the design and development of new metallic alloys with microstructural characteristics optimized for applications in coatings that requires superior properties of corrosion and wear resistance. For this, we propose to use the knowledge and experience of our group in the use of the fundamentals' concept of thermodynamic and kinetics of phase transformations involving liquid phase and only solid phases, with the assistance of computational methods followed by experimental validation, to facilitate and accelerate the development of new metallic alloys specific for coatings applications. The alloys to be studied primarily include different families of multicomponent alloys, inclusive the high entropy or pseudo-high entropy alloys, with compositions initially based on commercial steels with additions of B, designed to improve the glass forming ability and to optimize corrosion and wear resistance in different microstructural conditions, i.e., amorphous, partially crystalline or even totally crystalline. For the different systems we will be using theoretical / computational methods and experimental methods for production of samples that optimize the mapping of compositions of interest and the choice of alloys with different characteristics, to be produced and tested in relation to the properties of corrosion resistance and wear resistance. Alloys that have optimized combinations of these two properties, which are fundamentally contradictory, will be used to produce coatings in steels, through different deposition processes. The project involves, therefore, the design of alloys, the manufacture of the alloys selected for experimental validation, the atomization to obtain suitable powders for the coating processes, the processing to obtain coatings, and, in all stages, the complete calorimetric, structural and microstructural characterization. In the relevant stages, electrochemical methods will be used to characterize the corrosion properties and wear measurements to evaluate the mechanical properties. (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)
RODRIGUES, L. C. M.; KOGA, G. Y.; FREITAS, B. J. M.; FIGUEIRA, G.; GARGARELLA, P.; BOLFARINI, C.; KIMINAMI, C. S.; BOTTA, W. J.. Wear-resistant Fe68Cr8Mo4Nb4B16 glass former coatings-From powder production by gas atomization to coating build-up by Laser Powder Bed Fusion. SURFACE & COATINGS TECHNOLOGY, v. 441, p. 12-pg., . (13/05987-8, 19/05885-7, 19/01829-5, 17/27031-4, 21/08514-0)
KOGA, G. Y.; NASCIMENTO, A. R. C.; ETTOUIL, F. B.; RODRIGUES, L. C. M.; ZEPON, G.; BOLFARINI, C.; KIMINAMI, C. S.; BOTTA, W. J.; SCHULZ, R.; SILVA, A. COSTA E; et al. Thermally sprayed multi-principal element Cr40Co40Ni20 coatings - Oxidation upon coatings' build-up and electrochemical corrosion. SURFACE & COATINGS TECHNOLOGY, v. 454, p. 16-pg., . (21/04302-8, 21/08514-0)
WANG, FANG; INOUE, AKIHISA; KONG, FANLI; ZHU, SHENGLI; XIE, CHUNXIAO; ZHAO, CHENGLIANG; BOTTA, WALTER JOSE; CHANG, CHUNTAO. Formation and ultrahigh mechanical strength of multicomponent Co-based bulk glassy alloys. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 26, p. 12-pg., . (21/08514-0)

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