Stress annealing effect on the piezomagnetic coefficient of Fe-Al-B alloys

Author(s)

de Souza Dias, Mateus Botani ; Bormio-Nunes, Cristina

• Document type: Journal article
• Source: Physics Letters A; v. 383, n. 9, p. 8-pg., 2019-02-28.

Abstract

In the present work are reported the stress annealing (SA) effect on magnetic properties of Fe-Al-B alloys and the result on the piezomagnetic coefficient d(33)* =dB/d sigma vertical bar(H), where sigma is the applied stress, B is the magnetic induction and H is the applied magnetic field. The objective is to evaluate the potential use of these alloys as smart materials of force sensors. The study comprises two alloys with compositions (Fe0.87Al0.13)(98.4)B-1.6 (Al13) and (Fe0.82Al0.18)(98.4)B-1.6 (Al18). The microstructure, hysteresis loops and B vs. sigma vertical bar(H) were analyzed before and after the SA. Regarding the force sensitivity, the SA increased the piezomagnetic coefficient d(33)* due the introduction of an extrinsic anisotropy in both Fe-Al-B alloys. Moreover, the stress range, in which the piezomagnetic coefficient d(33)* is linear, is higher after the SA. Concerning the single phase (Fe0.87Al0.13)(98.4)B-1.6 alloy, the force pressure sensitivity and the linear stress range increase up to 16.8% and 47.1%, respectively. For the two phase (Fe0.82Al0.18)(98.4)B-1.6 alloy, the increase was a bit higher, but the curves B vs. a are hysteretic, spoiling the use of this material as a force sensor component. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 14/16872-0 - Optimization of the piezomagnetic properties of Fe-Al-B alloys for use in the force sensors
• Grantee: Mateus Botani de Souza Dias
• Support Opportunities: Scholarships in Brazil - Doctorate