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Journal of Electron Microscopy 51:S143-S147 (2002)
© 2002 Oxford University Press

Full-length paper

Electron microscopy study on Mo content dependence of ß to {omega} phase transformation due to cooling in Ti–Mo alloys

Eiichi Sukedai, Hajime Matsumoto and Hatsujiro Hashimoto

Okayama University of Science, 1-1, Ridai-cho, Okayama 700-0005, Japan

To whom correspondence should be addressed. E-mail: sukedai{at}mech.ous.ac.jp

Direct observation of the formation of athermal {omega} phase crystals ({omega}ath) in Ti-10, 15, and 20mass%Mo alloys resulting from ß to {omega} phase transformations due to cooling to 131 K, has been carried out using in situ dark-field imaging technique. The formations were confirmed in all three alloys. The formation temperatures depend on the Mo content and it is noted that the higher the Mo content, the lower the formation temperature. The relationship between the formation of {omega}ath and electrical resistivity in the three alloys is discussed and it seems that only the formation of {omega}ath cannot account for the change of the resistivity of Ti-15 and 20mass%Mo alloys. Annihilation behaviours of {omega}ath in Ti-15 and 20mass%Mo alloys due to the irradiation of electron beam accelerated at 200 kV were investigated and it was found that {omega}ath in the Ti-15mass%Mo alloy disappeared faster than that in the Ti-20mass%Mo alloy. It was suggested that both results about the formation and annihilation of {omega}ath due to cooling depend on the stability of the matrix connected with the amounts of ß-phase stabilizing Mo elements.

Keywords     {omega} phase transformation, Mo content dependence, formation temperature, cooling, annihilation, phase stability


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