Radiation induced precipitation in 9 MeV Al ion irradiated Ti-6A1-4V

Evolution of defects in Ti6-4 under Ti2+ ion irradiation: Focus on radiation-induced precipitates

“…In fact, when the irradiation temperature decreases, the diffusing length of punctual defects decreases, thus one expects a high nucleation rate and a slow growth of the precipitates. The rise in the precipitate size associated with a lowering of their density with a rise in the irradiation temperature was evidenced here and was also observed by different authors [9][10][11].…”

“…phase of Ti6-4 alloy. After irradiation at 700 °C , the presence of precipitates was not detected and dislocations seemed to pre dominate in the material [9,[11][12][13]. Table 1 collects irradiation conditions for neutron, proton and heavy ion experiments on Ti6-4 alloy from the literature, and main features of the microstructure observed in each case.…”

Phase instabilities during Ti-nitride precipitation in nitrogen implanted Ti-6AI-4V alloy

“…plasma nitrided (Raveh 1993) Ti-6AI-4V alloy in the nitrided zone. RIS of V atoms towards free surface during MeV irradiation of V (Wang et al 1982) or AI (Plumton et al 1987) at high temperatures have also been reported in earlier literature. However, RIS has remained difficult to identify in reactive N ÷ implantation in earlier studies (Qiu et al 1991), owing to surface and near-surface modification using low energies.…”

“…Possible existence of nitrides (Qiu et al 1990) as Ti(V)N is reported in the literature. Copious precipitation offl-Ti precipitates during MeV ion irradiation of Ti--6AI-4V are known (Wang et al 1982;Plumton et al 1987). The fl-Ti precipitates, thus formed are believed to owe their origin to radiation induced segregation (RIS) phenomenon.…”

Changes in hardness and elasticity of a Ti6Al4V alloy under helium irradiation

“…2(b), the hardness values of all the specimens at the depth of 50 nm are omitted, since the scattering of the data is too large at such small indentation depth due to the increasing influence of surface effects, e.g., of the surface roughness. higher temperatures, permitting the b-phase to be measured by GIXRD (Radiation-enhanced diffusion might stimulate the precipitation of the b-phase [9,16]). In comparison to the b-Ti peak of the samples irradiated at temperatures lower than 700°C, the width of the b-Ti peak of the sample irradiated at 700°C also decreased indicating an increase of the grain size of the b-phase.…”