J. Japan Inst. Metals, Vol. 63, No. 6 (1999),
pp. 806-807

Electron Microscope Observations of Athermal ω-Phase Crystal Formation and Growth Behaviors in a β-Ti Alloy Cooled to 77 K

Hajime Matsumoto, Eiichi Sukedai and Hatsujiro Hashimoto

Abstract:

It is known that ω-phase crystals in β-Ti alloys are formed by quenching, aging and stressing. It has also been predicted that athermal ω-phase crystals are formed by cooling from the negative temperature dependence of electrical resistivity in the alloys at low temperature. In order to clarify the formation of athermal ω-phase crystals formed by cooling, in-situ dark field image observations of an as-quenched Ti-15 mass%Mo alloy were carried out from room temperature to 77 K. In a specimen cooled to 77 K without electron irradiation, the formation of athermal ω-phase crystals was clearly observed, but when irradiated with electron beam the crystals were annihilated.

(Received February 22, 1999; In Final Form April 7, 1999)

Keywords:

athermal ω-phase crystals, in-situ dark field image observations, β-type Titanium-Molybdenum alloys, electron irradiation

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