Development of Fe-Co alloys with the addition of Ti and Cr for applications in high energy performance electric machines

• Grant number: 21/06350-0
• Support Opportunities: Regular Research Grants
• Start date: February 01, 2022
• End date: January 31, 2025
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Cristina Bormio Nunes
• Grantee: Cristina Bormio Nunes
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

Fe-Co alloys for Co mass % in the interval 25% < Co < 50% are of interest for use in electrical machines, as they have a high saturation magnetization value and a high Curie temperature. Both properties result in large energy efficiency of electric motors when the material is used as the magnetic core of these motors, as in the case of electric cars. This large efficiency is an urgent global demand, and the replacement of combustion cars by electric cars will also reduce pollution. Practically all the development of Fe-Co alloys with a lower cobalt content than the equiatomic alloy was carried out by the industry, which does not provide data from the researches carried out. In particular, for the binary Fe-Co alloy with 35% Co, there is only one published work and one patent, both made public in 1947. This work has been cited only 2 times and viewed 132 times, according to the IEEEXPlore website. Existing data do not allow us to understand what happens with this material in fundamental terms. For example, it is not clear how the addition of 0.5 mass% of Cr affects the magnetic and electrical properties of the binary alloy. Nor, what effect does it have on the material's ductility. The main goal of this project is to study more deeply and systematically the Fe-Co alloy with 35% Co with the addition of Cr, making the correlation of materials science/engineering with the physical properties of the material. This understanding may help in the future in some alloy formulation that will improve the magnetic and mechanical performance of these materials. The addition of Ti to the Fe-Co-Cr alloy is proposed to try to increase the magnetic permeability of this material, as this is poor compared to the equiatomic alloy. The reduction of Co in the alloy is also interesting, as it would act to make the material cheaper, because the price of cobalt is about 200 times higher than that of iron. (AU)

Scientific publications

(4)

(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)

SILVA, IRIS BRAGA; FROES, FERNANDO; ALVES FERREIRA, HIGOR NATAN; HUBERT, OLIVIER; BORMIO-NUNES, CRISTINA. Piezomagnetism in Cr dopped Fe₆₅Co₃₅ alloy.. 2024 IEEE INTERNATIONAL MAGNETIC CONFERENCE-SHORT PAPERS, INTERMAG SHORT PAPERS, v. N/A, p. 2-pg., 2024-01-01. (21/06350-0)

CARDOSO, FABIO MARTINS; FROES, FERNANDO; BORMIO-NUNES, CRISTINA. A novel high entropy FeCoNi(GaCu)_1.0 alloy with attractive soft magnetic properties. PHYSICA B-CONDENSED MATTER, v. 695, p. 10-pg., 2024-09-10. (21/06350-0, 17/26386-3)

FROES, FERNANDO; BORMIO-NUNES, CRISTINA. High-temperature magnetization and bulk magnetostriction investigation of Ti and Nb addition to Fe₇₀Co₃₀ alloy. Journal of Materials Science, v. 59, n. 4, p. 13-pg., 2024-01-11. (21/06350-0)

BORMIO-NUNES, CRISTINA; FROES, FERNANDO. Magnetostriction reduction and magnetic permeability enhancement of Ti added Fe0.7Co0.3 alloy. Journal of Applied Physics, v. 133, n. 12, p. 7-pg., 2023-03-28. (21/06350-0)