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

• Grant number: 16/12601-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2016
• End date: July 31, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Guilherme Zepon
• Grantee: Vítor Ramos Ferrari
• Host 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

Abstract

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.

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, SEP 2021. (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, FEB 15 2019. (13/05987-8, 17/21114-5, 16/12601-7)