| Автор | C Leroux |
| Автор | A Loiseau |
| Автор | M C Cadeville |
| Автор | D Broddin |
| Автор | G Van Tendeloo |
| Дата выпуска | 1990-04-16 |
| dc.description | A study of the order-disorder L1<sub>2</sub> to A1 transformation near a congruent point of the Co-Pt phase diagram is presented. This work was performed by combining in situ transmission electron microscopy observations, resistivity measurements carried out in conditions near thermodynamic equilibrium and high-resolution imaging on quenched samples. Resistivity measurements display three characteristic temperatures: 994 K, 1020 K and 1032 K. The evolution of the microstructure with temperature at different heating rates was followed in dark field images, until the order-disorder temperature was reached. It was found that at temperatures above 994 K ( approximately=40 K below T<sub>c</sub>), the antiphase boundaries (APB) undergo a structural change; the phenomenon becomes more pronounced as the temperature increases. High-resolution images of modified APB show thin layers of disordered phase in the core of these APB. This can be described as a wetting of the antiphase boundaries by the disordered phase. Above 1020 K, up to 1032 K, a second mechanism is superimposed; the disordering occurs through a nucleation, growth and coarsening of disordered regions inside the ordered domains. This nucleation and growth process starts at the beginning of the two-phase region (1020 K). These results are in excellent agreement with those from cluster variation method calculations performed by Kikuchi and Cahn (1979) and Finel and co-workers (1990). |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Order-disorder transformation in Co<sub>30</sub>Pt<sub>70</sub> alloy: evidence of wetting from the antiphase boundaries |
| Тип | paper |
| DOI | 10.1088/0953-8984/2/15/005 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 2 |
| Первая страница | 3479 |
| Последняя страница | 3495 |
| Аффилиация | C Leroux; Antwerp Univ., Belgium |
| Аффилиация | A Loiseau; Antwerp Univ., Belgium |
| Аффилиация | M C Cadeville; Antwerp Univ., Belgium |
| Аффилиация | D Broddin; Antwerp Univ., Belgium |
| Аффилиация | G Van Tendeloo; Antwerp Univ., Belgium |
| Выпуск | 15 |
