Nano-Crystallization and Stability of an Amorphous Phase in Fe-Nd-B Alloy under 2.0MeV Electron Irradiation
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Formation of nano-structure in melt-spun ternary Fe-Nd-B alloys was examined focusing on electron irradiation induced crystallization. In Fe<SUB>82.2</SUB>Nd<SUB>7.1</SUB>B<SUB>10.7</SUB> (Fe/Nd/B = 23/2/3), Fe<SUB>77</SUB>Nd<SUB>4.5</SUB>B<SUB>18.5</SUB> and Fe<SUB>71</SUB>Nd<SUB>9</SUB>B<SUB>20</SUB> alloys, melt-spun amorphous phase changed to a crystalline phase during electron irradiation and nano-structure was formed. The crystalline phase in melt-spun Fe<SUB>86</SUB>Nd<SUB>9</SUB>B<SUB>5</SUB> and Fe<SUB>82.4</SUB>Nd<SUB>11.8</SUB>B<SUB>5.8</SUB> (Fe/Nd/B = 14/2/1) alloys was unstable under electron irradiation and electron irradiation induced amorphization occurred. With the further irradiation, crystallization from the amorphous phase was induced resulting in forming nano-crystalline structure. The onset total dose for the irradiation induced crystallization, namely, stability of the amorphous phase against electron irradiation depends strongly on the Fe-ratio, crystallization temperature, mismatch entropy and mixing enthalpy of the alloys.
- Materials Transactions, JIM
Materials Transactions, JIM 49(2), 265-274, 2008-02-01
The Japan Institute of Metals and Materials