| Fe-based amorphous/nanocrystalline alloys have been widely used in electrical and electronic equipment such as transformers,mutual inductors and reactors due to their excellent soft magnetic properties,such as high permeability and saturation magnetic induction strength and low coercivity.In this paper,new Fe82-85B13-16Si1Cu1amorphous alloys were synthesized by melt spinning for developing good soft magnetic and high strength materials.Fe-based nanocrystalline ribbons were obtained by annealing treatment,and the crystallization mechanism of amorphous alloys was analyzed.The crystallization mechanism of amorphous alloy was analyzed.The soft magnetic and mechanical properties of nanocrystalline alloys were studied.The following main results were obtained:Fe82-85B13-16Si1Cu1 amorphous alloys exhibit the characteristics of two-step crystallization in the continuous heating process.The crystallization occurs through two stages:amorphous phase(Am)?Am+?-Fe??-Fe+Fe3B+Fe2B,and the first-stage onset temperature increases from 673 K to 705 K with increasing B content,while the second-stage temperature remains nearly constant.The?-Fe phase(about 30nm)precipitated in the first phase showed no significant change in nanocrystalline size over a wide temperature range before Tx2.The Fe-based alloys exhibited good soft magnetic properties both in annealed amorphous and nanocrystallized amorphous+?-Fe phases.The saturated magnetic flux density,coercivity and permeability at 1 k Hz are 1.7 T,4.92 A/m and 10100,respectively,for the annealed amorphous 14B alloy and 1.74 T,5.62 A/m and 7100,respectively,for the nanocrystallized 13B alloy.The Vickers hardness(Hv)of amorphous alloy decreases with increasing B content.The Vickers hardness increases significantly with increasing annealing temperature when the annealing temperature is between Tx1 and Tx2,and when the temperature is 763 K,Hv reaches 1370-1550. |
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