Abstract
The effect of pressure on the microstructure of α-Fe/Sm2(Fe, Si)17Cx nanocomposite magnets has been studied by annealing amorphous Sm8Fe85Si2C5 alloy under pressures up to 6 GPa at 923 K. The high-pressure experiments were carried out in a belt-type apparatus. Experimental results show that, with increasing pressure from normal pressure to 6 GPa, the grain size of the α-Fe and Sm2(Fe, Si)17Cx phases in the α-Fe/Sm2(Fe, Si)17Cx nanocomposites decreases, from 30.6 to 6.4 nm for the former and from 28.7 to 5.8 nm for the latter. The volume fraction of Sm2(Fe, Si)17Cx increases as pressure increases. The α-Fe/Sm2(Fe, Si)17Cx nanocomposite magnets prepared under 4 GPa have a significant increase in both coercivity and remanent magnetization as compared to those prepared under normal pressure.
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