Polycrystalline Fe₈₁Ga₁₉ alloy with magnetostriction comparable single-crystals prepared via laser powder bed fusion in-situ remelting

This study introduced the laser additive manufacturing strategy of an Fe-Ga alloy with magnetostriction of comparable to single crystal. The Fe₈₁Ga₁₉ alloy is fabricated by in-situ laser remelting in the laser powder bed fusion. It is found that not only the direct precipitation of L60 nanoprecipitates is achieved by the laser remelting strategy, but also its distribution, density, and size are controlled by the optimized process. At the same time, remelting enhances the easy magnetization direction <001> orientation of the Fe₈₁Ga₁₉ alloy. With this synergistic effect, the magnetostriction of the oriented polycrystalline Fe₈₁Ga₁₉ alloy reaches 208 ppm.