| Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys |
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| 作者姓名： | Ji-heng Li Chao Yuan Xing Mu Xiao-qian Bao Xue-xu Gao |
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| 作者单位： | State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | This study was financially supported by the National Natural Science Foundation of China(51501006)，State Key Laboratory for Advanced Metals and Materials(2017Z-11)，the Fundamental Research Funds for the Central Universities(FRF-GF-17-B2)，partly supported by a scholarship from the China Scholarship Council |
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| 摘 要： | 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.
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| 关 键 词： | magnetostriction iron-gallium alloys columnar grain ductility abnormal grain growth |
Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe–Ga rolled alloys |
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| Ji-heng Li,Chao Yuan,Xing Mu,Xiao-qian Bao,Xue-xu Gao.Enhancement of ductility and improvement of abnormal Goss grain growth of magnetostrictive Fe-Ga rolled alloys[J].International Journal of Minerals,Metallurgy and Materials,2018,25(4):444-452. |
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| Authors: | Ji-heng Li Chao Yuan Xing Mu Xiao-qian Bao Xue-xu Gao |
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| Institution: | 1.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,China |
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| Abstract: | The influences of initial microstructures on the mechanical properties and the recrystallization texture of magnetostrictive 0.1at% NbC-doped Fe83Ga17alloys 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℃C and 12.0% at 500℃C of the hot-forged equiaxed-grained alloys, the columnar-grained alloys exhibited substantially increased tensile elongations of 21.6% at 300℃C and 46.6% at 500℃C. In the slabs for rolling, the introduction of <001>-oriented columnar grains also pro-motes the secondary recrystallization of Goss grains in the finally annealed sheets, resulting in an improvement of the saturation magneto-striction. 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. |
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