Effect of heat treatments on microstructure of rapidly solidified TiCo ribbons

Kyosuke Yoshimi, Akira Yamauchi, Ryusuke Nakamura, Sadahiro Tsurekawa, Shuji Hanada

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1 Citation (Scopus)


The effect of heat treatments (aging or annealing) on microstructure was investigated for rapidly solidified ribbons of near-stoichiometric TiCo. In as-spun ribbons, it was observed by TEM that an equiaxed grain structure was developed and its crystal structure had been already B2-ordered, while a small amount of a second phase, Ti2Co, finely disperses in grains and along grain boundaries. Some grains were dislocation-free but others contained curved or helical dislocations and prismatic loops having a Burgers vector parallel to 〈100〉 directions. By annealing the as-spun ribbons at 700°C for 24h, the dislocation density was obviously increased compared with that of the as-spun ribbons, while grain growth appears to occur slightly. The increase of the dislocation density in the annealed ribbons is believed to result from the condensation and/or absorption of supersaturated vacancies. Therefore, the TEM observation results indicate that a large amount of supersaturated thermal vacancies were retained in the TiCo ribbons by the rapid solidification.

Original languageEnglish
Article numberS1.5
Pages (from-to)449-454
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2005
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 1


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