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Effect of the cooling rate on the microstructure of High-Entropy Alloys of the AlxCoFeCrNiBy system

Grant number: 16/12601-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2016
Effective date (End): July 31, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal researcher:Guilherme Zepon
Grantee:Vítor Ramos Ferrari
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys, AP.TEM
Associated scholarship(s):17/21114-5 - Study and characterization of phase formation and stability in an AlCoCrFeNiB0.1 high entropy alloy, BE.EP.IC


High-entropy alloys (HEA) belong to a new class of alloys whose compositions are based on at least five major elements. As a result of this mixture of elements, the effect of the high entropy is relevant, which allows the formation of multi-component solid solutions, which usually have simple crystalline structures. HEA has promoted the interest of researchers from all over the world due to its microstructural features and a wide range of properties. Among the properties that have been reported, some HEA stand out for properties of high wear resistance. The research group of DEMa/UFSCar has been devoted in recent years to the development of alloys for use as coatings that have at the same time high resistance to wear and to corrosion. The processes usually employed in producing the metallic coatings generally involve rapid solidification. Based on that, this research project proposes a study of the effect of cooling rate on the microstructure evolution of HEA of the AlxCoFeCrNiBy system containing small amounts of boron. The addition of small amount of boron in the composition of the HEA favors the formation of hard borides, which are reported as being extremely beneficial for wear resistance of the alloys. Thus, this project proposes the evaluation of the effect of cooling rate during solidification of alloys in the formation of the high entropy phase and the fraction, distribution and morphology of the formed borides.

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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)
BERGER, J. E.; JORGE JR, A. M.; KOGA, G. Y.; ROCHE, V.; KIMINAMI, C. S.; BOLFARINI, C.; BOTTA, W. J.. Influence of chromium concentration and partial crystallization on the corrosion resistance of FeCrNiB amorphous alloys. MATERIALS CHARACTERIZATION, v. 179, . (17/21114-5, 16/12601-7, 13/05987-8)
FERRARI, V; WOLF, W.; ZEPON, G.; COURY, F. G.; KAUFMAN, M. J.; BOLFARINI, C.; KIMINAMI, C. S.; BOTTA, W. J.. Effect of boron addition on the solidification sequence and microstructure of AlCoCrFeNi alloys. Journal of Alloys and Compounds, v. 775, p. 1235-1243, . (13/05987-8, 16/12601-7, 17/21114-5)

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