Multiscale influence of trace Tb addition on the magnetostriction and ductility of 100 oriented directionally solidified Fe-Ga crystals

Yuye Wu, Yijun Chen, Chongzheng Meng, Hui Wang, Xiaoqin Ke, Jingmin Wang, Jinghua Liu, Tianli Zhang, Ronghai Yu, J. M. D. Coey, Chengbao Jiang, and Huibin Xu
Phys. Rev. Materials 3, 033401 – Published 15 March 2019

Abstract

New-generation magnetostrictive applications in micromanipulation instruments, torque sensing, and transducers require materials that offer a combination of large magnetostriction and good structural properties. Fe100xGax-based(x=1719) alloys are potential candidates. In this work, the solidification behavior of Tb-doped FeGa alloys is investigated by theoretical simulation and experimental observation; directional solidification parameters are optimized to obtain the largest solid solubility of Tb while keeping the 100 preferred orientation. The multiscale evolution of the structure with Tb additions that enhances both magnetostriction and tensile properties is systematically studied in alloys prepared under optimal directional solidification conditions. Magnetostriction of 387 ppm is accompanied by a remarkable tensile fracture strain of 12.5% in 0.05 at.% Tb-doped Fe81Ga19. The values represent an improvement of 29% in magnetostriction and a sixfold enhancement in tensile fracture strain compared with undoped binary Fe81Ga19. The increase in magnetostriction is attributed to the higher density of tetragonally modified D03 nanoinclusions induced by traces of Tb. The enhancement in ductility is explained by the dislocation concentration around the submicron-scale Tb-rich precipitates which can effectively hinder their motion. The FeGa alloys doped with traces of Tb can be easily processed to thin sheets or wires and are likely to be extensively applied because they contain only traces of rare earths.

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  • Received 24 April 2018
  • Revised 16 August 2018

DOI:https://doi.org/10.1103/PhysRevMaterials.3.033401

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuye Wu1,*, Yijun Chen1, Chongzheng Meng1, Hui Wang1, Xiaoqin Ke2, Jingmin Wang1, Jinghua Liu1, Tianli Zhang1, Ronghai Yu1, J. M. D. Coey1,3, Chengbao Jiang1,†, and Huibin Xu1

  • 1Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
  • 2Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, People's Republic of China
  • 3School of Physics and CRANN, Trinity College, Dublin 2, Ireland

  • *Corresponding author: wuyuye@buaa.edu.cn
  • jiangcb@buaa.edu.cn

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Vol. 3, Iss. 3 — March 2019

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