Substructure Development in Rapidly Solidified B2-Type TiCo Ribbons |
| Journal |
Materials Science Forum (Volumes 475 - 479) |
| Volume |
PRICM-5 |
| Edited by |
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie |
| Pages |
849-852 |
| DOI |
10.4028/www.scientific.net/MSF.475-479.849 |
| Online since |
January, 2005 |
| Authors |
Kyosuke Yoshimi, Minseok Sung, Sadahiro Tsurekawa, Akira Yamauchi, Ryusuke Nakamura, Shuji Hanada, Koichi Kawahara, Tadao Watanabe |
| Keywords |
dislocations, Intermetallic Compound, Rapid Solidification, TiCo, Vacancy |
| Abstract |
Substructure development through aging and annealing treatments was studied for
rapidly solidified TiCo ribbons using TEM. In as-spun ribbons, equiaxed grain structure was developed and its crystal structure was B2-ordered immediately after melt-spinning, while a small amount of fine precipitates existed as second phase. Some grains were dislocation-free but others contained a certain amount of curved or helical dislocations and loops. The dislocation density in the ribbons annealed at 700 °C for 24 h was obviously higher than those in the as-spun ribbons and the ribbons aged at 200 °C for 100 h. The increase of the dislocation density in the annealed ribbons would result from the absorption of excess vacancies. Therefore, the obtained results indicated that a large amount of supersaturated thermal vacancies were retained in TiCo as-spun ribbons by the rapid solidification. |
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