Abstract
The crystallization behavior of as-quenched Nd9Fe85Nb0.5B5.5 alloy was investigated in order to gain further understanding of the structural evolution of the α-Fe and metastable phase, and then verified it by TEM. The result shows that the crystallization can be viewed as a process consisted of the following two steps. Firstly, the TbCu7-type metastable phase and a small amount of α-Fe precipitate from the matrix. Then, the TbCu7-type metastable phase is decomposed into the α-Fe and Nd2Fe14B phase with suitable sizes. The decomposition of metastable phase can promote the crystallization of Nd2Fe14B phase, so it could be considered as an ‘autocatalysis’ process. In addition, the crystallization kinetic parameters of the Nd2Fe14B phase have also been obtained base on the resolved differential scanning calorimetry peaks. The results provide a physical and dynamic insight into the crystallization behavior of as-quenched Nd9Fe85Nb0.5B5.5 alloys.
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