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Assessment of Fe–Ga–B alloy magnetomechanical behavior

Published online by Cambridge University Press:  12 July 2018

Cristina Bormio-Nunes*
Affiliation:
Escola de Engenharia de Lorena, Departamento de Engenharia de Materiais, Universidade de São Paulo, Lorena, São Paulo 12602-810, Brazil
Fábio Martins Cardoso
Affiliation:
Escola de Engenharia de Lorena, Departamento de Engenharia de Materiais, Universidade de São Paulo, Lorena, São Paulo 12602-810, Brazil
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The Fe–18.6% Ga alloy (at.%) has a high magnetostriction and an excellent piezomagnetic (PZM) property. However, Fe–Ga has a poor ductility and the addition of B helps to improve this property. The magnetostriction of the Fe–Ga alloy is not appreciably improved by the addition of B; however, the PZM behavior of Fe–Ga–B is unknown up to now. Then, an Fe–Ga alloy with 2% of B was produced to evaluate the effect of boron addition on the PZM property of the Fe–Ga alloy. The PZM force sensing performance coefficient d33* decreased, but the maximum sensitivity is reached for a fixed magnetic field. In addition, d33* values are among 2 and 5 mT/MPa, which is sufficient for many applications. A better ductility compared to Fe–Ga and a good sensitivity at constant field, makes the alloy Fe–Ga–B a good candidate for application as force sensors up to stresses of 80 MPa.

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Article
Copyright
Copyright © Materials Research Society 2018 

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References

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