| Автор | Z J Zhang |
| Автор | B X Liu |
| Дата выпуска | 1994-03-28 |
| dc.description | In the Co-Nb system, seven amorphous alloys were synthesized by room-temperature 200 keV xenon ion mixing of multilayered films with various compositions. The composition range favouring amorphization was determined to be from 23 to 80 at.% Co. In addition, two metastable crystalline (MX) phases were consecutively formed in the Co<sub>23</sub>Nb<sub>77</sub> multilayered films, i.e. an HCP phase at a dose of 1*10<sup>15</sup> Xe<sup>+</sup> cm<sup>-2</sup> and a FCC phase at a dose of 6*10<sup>15</sup> Xe<sup>+</sup> cm<sup>-2</sup>. The thermal stabilities of both ion-mixed amorphous alloys and the MX phases were examined by subsequent annealing. To obtain a deep insight concerning all the above observations, a free-energy diagram of the Co-Nb system was constructed by calculating the free-energy curves of the solid solutions, the amorphous phase, the equilibrium compound and the MX phases, which were considered as compound-like phases. To test the relevance of the constructed diagram in its outline, steady-state thermal annealing of the as-deposited Co<sub>23</sub>Nb<sub>77</sub> multilayered films was performed and the results confirmed the calculated relative energy levels of the phases considered. The free-energy diagram can explain the amorphization range as well as the observed evolution of the ion-mixed phases. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Solid state phase transition induced by ion irradiation in the Co-Nb system: experiments and thermodynamics |
| Тип | paper |
| DOI | 10.1088/0953-8984/6/13/022 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 6 |
| Первая страница | 2647 |
| Последняя страница | 2658 |
| Аффилиация | Z J Zhang; Dept. of Mater. Sci. & Eng., Tsinghua Univ., Beijing, China |
| Аффилиация | B X Liu; Dept. of Mater. Sci. & Eng., Tsinghua Univ., Beijing, China |
| Выпуск | 13 |
