Abstract
Formation of athermal ω-phase crystals due to cooling to 131 K has been directly observed in a β-type Ti-15mass%Mo alloy. The athermal ω-phase crystals easily disappear by electron irradiation during the in-situ observation at 131 K. Incubation phenomenon of the annihilation is also recognized. The annihilation behaviour was investigated based on the dependence on electron irradiation conditions and incubation phenomena. It is concluded that the annihilation mechanism is concerned with interactive effects of temperature rise due to electron irradiation and collective oscillation resulted from inelastic scattering of electron beam.
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