Formation of Fe73.5Cu1Nb3Si13.5B9 Nanocrystalline Soft Magnetic Bulk Alloys in High Pressure

Abstract

Abstract: Fe_73.5Cu₁Nb₃Si_13.5B₉soft magnetic alloy powders and its bulk alloys were prepared by the mechanical
alloying (MA) method and cryogenical high pressure solidification process. Phase components, average grain size, thermal stability of powders and relative
density of bulk alloys of the samples were analyzed by XRD, DSC, SEM and TEM. The results showed that (1) after MA for 70 hours, bcc single phase α-Fe
nanocrystalline supersaturate solid solution powders with average grain size 9.5nm can be obtained; (2) four exothermal peaks with different intensity
appeared in DSC heating-up curves, these peaks corresponded to structural relaxation of distorted nanocrystalline supersaturate solid solution,
crystallization of small quantity amorphous and phase precipitation of supersaturate solid solution, respectively. Phase precipitation of
supersaturate solid solution included two stages; (3) under the sintering conditions of P=5.5GPa, t=5min and P_w=980W, single phase α-Fe
nanocrystalline bulk alloys with 98.4% relative density and about 12.5nm average grain size can be obtained, soft magnetic properties of
the bulk alloys were specific saturation magnetization M_s=1.71×10^-7Wb·m/g, coercive force H_c=8.22×10³A/m.

Key words: Fe-based soft magnetic alloys, MA, high pressure shaping, nanocrystalline

CLC Number:

TM27
TF123

LU Bin,YI Dan-Qing,LIU Yan,LU Chang-Wei,YU Hui-Mei. Formation of Fe_73.5Cu₁Nb₃Si_13.5B₉ Nanocrystalline Soft Magnetic Bulk Alloys in High Pressure[J]. Journal of Inorganic Materials.

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Formation of Fe_73.5Cu₁Nb₃Si_13.5B₉ Nanocrystalline Soft Magnetic Bulk Alloys in High Pressure

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