Laser-beam powder bed fusion and post-build annealing of polycrystalline Fe81Ga19 alloys: Microstructure manipulation and magnetostrictive properties

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-03-13 DOI:10.1016/j.intermet.2025.108734

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.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

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. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.