Tailoring magnetostriction and magnetic domains of <100>-oriented Fe 80 Ga 16 Al 4 alloy by magnetic field anneali
- PDF / 974,007 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 103 Downloads / 207 Views
RARE METALS
ORIGINAL ARTICLE
Tailoring magnetostriction and magnetic domains of -oriented Fe80Ga16Al4 alloy by magnetic field annealing Xin-Lei Wang, Yuan Liu*
, Xiang Chen
Received: 17 December 2019 / Revised: 25 April 2020 / Accepted: 9 September 2020 Ó GRINM Bohan (Beijing) Publishing Co., Ltd 2020
Abstract Magnetic field annealing (MFA) was used to tailor the magnetostriction and magnetic domains of Fe80Ga16Al4 alloy, and the relationship between the two characteristics was studied. The \100[-oriented alloy was prepared by the directional solidification technique and annealed for 20 min at 700 °C in a magnetic field of 250 mT along a direction 45° to the \100[ orientation, followed by furnace cooling in the same magnetic field. The magnetostriction along the length direction (kk), the width direction (k? ) and the saturation magnetostriction (ks) was changed from kk = 208 9 10-6 and k? = - 16 9 10-6 of the initial alloy to kk & - k? & ks & 112 9 10-6 after MFA. The magnetic domain structure, which mainly refers to the number, size, and direction of the domains, was tailored and rearranged by MFA. This rearrangement of the magnetic domain structure resulted in a shift of magnetostrictive properties parallel and perpendicular to the \100[ orientation for the Fe80Ga16Al4 alloy. This magnetic field annealing method can aid understanding of the relationship between the microscopic magnetic domains and the macroscopic magnetostrictive properties. It can also aid in further tailoring better magnetostrictive properties within magnetostrictive materials to meet the requirements of different application conditions. Keywords FeGa alloy; Magnetic field annealing; Magnetostriction; Magnetic domain X.-L. Wang, Y. Liu*, X. Chen School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China e-mail: [email protected] Y. Liu, X. Chen Key Laboratory for Advanced Materials Processing Technology Ministry of Education, Beijing 100084, China
1 Introduction Magnetostrictive materials have attracted widespread attention due to their usefulness in actuators, sensors, transducers and energy harvesting. Compared with Terfenol-D materials, FeGa alloys exhibit acceptable magnetostrictive properties, a low saturation magnetic field, low cost, good mechanical properties and a high Curie temperature (TC \650 °C) [1–7]. These unique advantages make FeGa alloys a sustainable alternative to the conventional Terfenol-D materials. Substituting the nonmagnetic Ga into the body-centered cubic (bcc) a-Fe may lead to a tenfold enhancement of magnetostriction. Two peaks are evident on the curve of 3/2 k100 as a function of Ga concentration in the single-crystal FeGa alloys, where the first peak appears near 18.2 at% Ga (i.e., * 350 9 10-6) and the second peak near 28.5 at% Ga (i.e., * 380 9 10-6) [8]. The significant enhancement of the magnetostriction in FeGa alloys is attributed to the oriented \001[ Ga–Ga atom pairs and the D03 phase present at the nanoscale [9, 10]. The effect of alloying element addition on th
Data Loading...
