Abstract
The amorphous Nd 7Fe 86Nb 1B 6 ribbons were prepared using the melt-spinning method. The relationship between the heating rate up to the annealing temperature and the crystallization behavior was investigated by the calorimetric technique and thermomagnetic measurement. The results show that under the slow heating rate of 10°C/min up to the annealing temperature, the intermediate metastable phases Nd 2Fe 23B 3 and Nd 3Fe 62B 14 are present in the initial crystallization stage. With the increase of temperature, the two phases decompose into the final mixture of Nd 2Fe 14B and α-Fe phases at different temperatures. For the increased heating rate of 30°C/min, all transformations occur at higher temperatures. When the heating rate is further raised to 60°C/min, the intermediate phases Nd 2Fe 23B 3 and Nd 3Fe 62B 14 decompose at the same temperature. When the heating rate is as rapid as 90°C/min, the appearance of intermediate phases was not observed. The result of VSM (vibrating sample magnetometer) measurement shows that magnetic properties can be improved by the increase of heating rate up to the crystallization temperature. The relationship between the heating rate and the microstructure was also studied.
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