Fe-Ga-based alloys are considered promising magnetostrictive candidates because of their high permeability and favorable mechanical properties.However,currently developed Fe-Ga-based alloys often suffer from a limited...Fe-Ga-based alloys are considered promising magnetostrictive candidates because of their high permeability and favorable mechanical properties.However,currently developed Fe-Ga-based alloys often suffer from a limited capability for microstructure manipulation,which restricts their magnetostrictive performance.To address this limitation,this study proposes a novel strategy combining laser-beam powder bed fusion(LPBF)and aging treatment to modulate the microstructure and enhance magnetostrictive properties of Fe-Ga-B alloys.Considering the positive influence of B element on magnetostrictive property and ductility,B-doped magnetostrictive Fe-Ga alloys were prepared via the LPBF process and then aged at 600℃for varying times(1,2,and 3 h,respectively).The LPBF process,characterized by high thermal gradients and rapid solidification,produced a microstructure featuring<001>oriented grains and sparse m-D0_(3)nanoprecipitates embedded in an A2 matrix.After the aging treatment,sufficient nucleation and growth of nanoprecipitates were enhanced.Specifically,the sample aged for 2 h developed a high density of larger m-D0_(3)nanoprecipitates.This optimized microstructure yielded a high magnetostrictive strain of(109±12)ppm and a substantially reduced saturation field—decreased by~49.1%compared to the as-fabricated state—primarily due to the synergistic effect of the<001>texture and the dense nanoprecipitates.Moreover,all the prepared alloys exhibited good soft-magnetic characteristics and comparable mechanical properties.Therefore,the combination of LPBF and aging treatment offers a promising route for tailoring the macro/microstructure and performance of magnetostrictive Fe-Ga alloys for diverse applications.展开更多
基金supported by the Hunan Provincial Natural Science Foundation of China(Grant No.2025JJ30015)the National Natural Science Foundation of China(Grant Nos.52571276,52275395,U24A20120,52475362)+4 种基金the Science and Technology Innovation Program of Hunan Province(Grant No.2023RC3046)the National Key Research and Development Program of China(Grant No.2023YFB4605800)the Central South University Innovation-driven Research Programme(Grant No.2023CXQD023)the Jiangxi Provincial Natural Science Foundation of China(Grant No.20224ACB204013)the Project of State Key Laboratory of Precision Manufacturing for Extreme Service Performance of Central South University and the Fundamental Research Funds for the Central Universities of Central South University(Grant No.1053320230182)。
文摘Fe-Ga-based alloys are considered promising magnetostrictive candidates because of their high permeability and favorable mechanical properties.However,currently developed Fe-Ga-based alloys often suffer from a limited capability for microstructure manipulation,which restricts their magnetostrictive performance.To address this limitation,this study proposes a novel strategy combining laser-beam powder bed fusion(LPBF)and aging treatment to modulate the microstructure and enhance magnetostrictive properties of Fe-Ga-B alloys.Considering the positive influence of B element on magnetostrictive property and ductility,B-doped magnetostrictive Fe-Ga alloys were prepared via the LPBF process and then aged at 600℃for varying times(1,2,and 3 h,respectively).The LPBF process,characterized by high thermal gradients and rapid solidification,produced a microstructure featuring<001>oriented grains and sparse m-D0_(3)nanoprecipitates embedded in an A2 matrix.After the aging treatment,sufficient nucleation and growth of nanoprecipitates were enhanced.Specifically,the sample aged for 2 h developed a high density of larger m-D0_(3)nanoprecipitates.This optimized microstructure yielded a high magnetostrictive strain of(109±12)ppm and a substantially reduced saturation field—decreased by~49.1%compared to the as-fabricated state—primarily due to the synergistic effect of the<001>texture and the dense nanoprecipitates.Moreover,all the prepared alloys exhibited good soft-magnetic characteristics and comparable mechanical properties.Therefore,the combination of LPBF and aging treatment offers a promising route for tailoring the macro/microstructure and performance of magnetostrictive Fe-Ga alloys for diverse applications.
