The dominant irradiation response of several titanium alloy systems is
the production of different phases. Previous studies have shown that a
thermally unstable bcc,β, phase precipitates out in the hcp matrix
during irradiation. In this paper, the extent of this phase separation
in Ti-6A1-4V is examined as a function of temperature for low dose ion
irradiations. The alloy Ti-6A1-4V was irradiated ... [Show full abstract] with 9 MeV Al ions to 2
dpa at a 2 μ depth over a 500-700°C temperature range. The
densities of the radiation-induced β precipitates were found to
decrease at high temperatures while the size increased. The original
grain boundary β phase shows no radiation effect until 650°C
when it undergoes a transformation to a Widmanstätten morphology.
An EDS analysis of the radiation-induced β phase indicates it is
50% higher in vanadium when compared to the thermally predicted vanadium
concentration. The total fraction of bcc phase present in the irradiated
region is drastically altered.