Optimization of the piezomagnetic properties of Fe-Al-B alloys for use in the force sensors

• Grant number: 14/16872-0
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): December 01, 2014
• Effective date (End): August 31, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Cristina Bormio Nunes
• Grantee: Mateus Botani de Souza Dias
• Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

We intend to optimize the piezomagnetic properties of Fe-Al-B alloys. These properties will be correlated with quantitative measurements of ordering of cubic phases and texture of the material. For materials that can be tested in a newly built transducer, it is necessary to have cylindrical specimens of 6 mm diameter and 100 mm in length. To obtain proper size material to be tested in a transdutor recently constructed by the student in his master dissertation, we adapt the conditions of furnaces of our Department and this is a procedure that had never been done. Annealing under application of mechanical compression will also be applied to the material, with the goal of building a magnetocrystalline anisotropy in the material and thus try to improve the piezomagnetic behavior. Moreover, the introducing of preferred texture by laminating sheets of the same alloy, in order to evaluate the effect this texture on the magnetostriction as a function of the applied field. Has already been seen in other works of the group that the atomic order decisively influence the values of the saturation magnetostriction and this order depends on the alloy composition in the vicinity of 20% at. of aluminum. Therefore, we will study several Fe-Al-B alloys, fixing the amount of boron in 3% at. And will vary the proportion of iron and aluminum to determine the best ratio between Fe and Al. previously in another study the ratio between Fe and Al remained constant and varied the amount of boron. In addition, the influences will be assessed on the results of texture in magnetostrictive alloys: 1) without undergoing processes of texturing; 2) rolled and annealed and also 3) samples that will undergo annealing on compression. More specifically, the present work aimed to study the magnetic properties: magnetostriction and magnetic induction (magnetic permeability) of the alloys (Fe1-xAlx) 97B3, for x = 0.16; 0.18; 0.20 and 0.22 in static and dynamic conditions, with the application of magnetic field, mechanical tension and compression using the transducer built in the master thesis of the candidate. Quantitative texture analysis will be performed using electron backscatter diffraction (EBSD) in scanning electron microscopy by measuring the crystallographic orientation punctually. The proof of the existence of the ordered phase can be accessed by electron diffraction in transmission electron microscopy and the quantification of the ordered phase can be made by measuring the saturation magnetization because the average magnetic moment per Fe atom is 33% higher in ± ordered phase in the phase D03.

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)

DIAS, M. B. S.; FULOP, G. O.; BALDAN, C. A.; BORMIO-NUNES, C. Magnetostriction Increase of Polycrystalline Fe-Al-B Thin Sheets after Thermomechanical Process. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 48A, n. 12, p. 5951-5959, DEC 2017. Web of Science Citations: 1.

BORMIO-NUNES, CRISTINA; DE SOUZA DIAS, MATEUS BOTANI. Piezomagnetic Performance of Stress-Annealed FeAlB Alloys. IEEE Transactions on Magnetics, v. 53, n. 11 NOV 2017. Web of Science Citations: 1.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

DIAS, Mateus Botani de Souza. Optimization of the piezomagnetic properties of Fe-Al-B alloys for use in the force actuators and sensors. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de Lorena Lorena.