Chengde Gao , Xiong Yao , Qi Zeng , Wei Tan , Shuaishuai Zhu , Ping Wu , Cijun Shuai
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引用次数: 0
Abstract
Magnetostrictive polycrystalline Fe-Ga alloys are gaining increasing attention for boarder practicalities, unfortunately, always facing limitations in magnetostrictive properties hindered by random grain structure and complex phase composition. In this work, an innovative method was established to fabricate massive polycrystalline Fe81Ga19 alloys via laser-beam powder bed fusion (LPBF) followed by post-build annealing treatment, and the magnetostrictive performances of the LPBF-fabricated Fe-Ga alloys annealed at various temperatures (800, 1000, and 1200 °C) were systematically investigated. Microstructural analyses revealed that <001> grain orientation and disordered A2 structure were obtained within the LPBF-fabricated (LPBFed) Fe81Ga19 alloys as a result of the steep temperature gradient and rapid solidification. Furthermore, the post-LPBF annealing treatment promoted the grain growth and release of residual stresses, simultaneously accompanied by intensified oriented texture within the annealed alloys. As a result, the Fe81Ga19 alloy annealed at 1200 °C showed optimal magnetostrictive performances with a magnetostrictive strain of ∼70 ppm and especially a 64 % reduction in saturation field relative to the LPBFed alloy. Moreover, the prepared Fe-Ga alloys also manifested good magnetostrictive dynamic response and desirable soft magnetic properties. In addition, electrochemical tests also indicated accelerated corrosion for the annealed alloys owing to the increased grain sizes. This work may pave a processing base to fabricate structure-tailored polycrystalline magnetostrictive Fe-Ga alloys for diverse applications.
期刊介绍:
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
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Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
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