The effect of Hf substituting for Cu on the glass-forming ability (GFA), crystallization behavior, and saturation magnetization (Ms) in Fe-rich Fe85Si2B8P4Cu1−xHfx alloys has been investigated. The result shows that the addition of Hf plays a positive role in improving GFA, and the Fe85Si2B8P4Cu0.5Hf0.5 alloy ribbon shows an entirely amorphous structure. Both the ribbons of Fe85Si2B8P4Cu1 and Fe85Si2B8P4Cu0.5Hf0.5 have two obviously exothermic crystallization peaks, and the addition of Hf improves the onset temperatures of both first and second crystallization peaks, and leads to the improvement of the thermal stability of the amorphous alloys. For the Fe85Si2B8P4Cu0.5Hf0.5 ribbon, after annealing at 623 K, crystallization seeds with sizes of 2–4 nm are found and the initial crystallization has occurred; as the annealing temperature is increased to 723 and 823 K, the size distribution of most of the grains is about 20 nm and bigger than 20 nm, respectively. The Ms of the Fe85Si2B8P4Cu0.5Hf0.5 ribbon is about 154 emu/g, which is obviously lower than 205 emu/g of the Fe85Si2B8P4Cu1 ribbon. However, after annealing at 723 K, the Ms increases to 212 emu/g for the former alloy. The newly developed amorphous/nanocrystalline Fe-Si-B-P-Cu-Hf alloy with excellent soft magnetic properties shows a potential application for substituting partial Si steels.
Glass-forming ability Crystallization behavior Exothermic peaks Saturation magnetization Grain sizes
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This work is supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No: 20124420110007), the Demonstration Dase Fund for Joint Training Graduate of Guangdong Province (No: 2013JDXM27), the National Natural Science Foundation of China (No: 51201038), and the National Natural Science Foundation of Guangdong (No: 2015A030313488).
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