Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys

Ji-heng Li; Chao Yuan; Xing Mu; Xiao-qian Bao; Xue-xu Gao

doi:10.1007/s12613-018-1590-y

Volume 25 Issue 4

Apr. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(4): 444-452

Ji-heng Li, Chao Yuan, Xing Mu, Xiao-qian Bao, and Xue-xu Gao, Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 444-452. https://doi.org/10.1007/s12613-018-1590-y

Cite this article as:

Ji-heng Li, Chao Yuan, Xing Mu, Xiao-qian Bao, and Xue-xu Gao, Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 4, pp. 444-452. https://doi.org/10.1007/s12613-018-1590-y

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Research Article

Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys

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Corresponding author:
Ji-heng Li E-mail: lijh@ustb.edu.cn
Received: 13 October 2017; Revised: 30 November 2017; Accepted: 8 December 2017

Abstract

Abstract

The influences of initial microstructures on the mechanical properties and the recrystallization texture of magnetostrictive 0.1at% NbC-doped Fe₈₃Ga₁₇ alloys were investigated. The directionally solidified columnar-grained structure substantially enhanced the tensile elongation at intermediate temperatures by suppressing fracture along the transverse boundaries. Compared with tensile elongations of 1.0% at 300℃ and 12.0% at 500℃ of the hot-forged equiaxed-grained alloys, the columnar-grained alloys exhibited substantially increased tensile elongations of 21.6% at 300℃ and 46.6% at 500℃. In the slabs for rolling, the introduction of <001>-oriented columnar grains also promotes the secondary recrystallization of Goss grains in the finally annealed sheets, resulting in an improvement of the saturation magnetostriction. For the columnar-grained specimens, the inhomogeneous microstructure and disadvantage in number and size of Goss grains are improved in the primarily annealed sheets, which is beneficial to the abnormal growth of Goss grains during the final annealing process.
- magnetostriction;
- iron-gallium alloys;
- columnar grain;
- ductility;
- abnormal grain growth

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