Hydrogen behaviour in electron-irradiated titanium alloys studied by positron annihilation method

Abstract

Measurements of angular distribution of annihilation photons are applied to investigations of hydrogen behavior in annealed, plastically deformed, and irradiated titanium alloys. It is shown that hydrogen interaction with materials becomes more intensive in presence of structural imperfections of deformational and radiation origin. Probable mechanisms of hydrogen interaction with deformational and radiation defects are discussed.

Radiation-induced effects in titanium alloys by α-particles irradiation

“…In [6], it is shown that the vacancy defects become mobile at temperatures higher than 100°С. Therefore, when irradiating, it is necessary to keep the sample temperature lower than the mentioned level, which is basically not difficult to achieve.…”

Physicochemical and Radiation Modification of Titanium Alloys Structure

“…In order to tackle this task, as an objects of the experimental study iodide titanium and a system of Ti-Al alloys (up to 50 at.% Al) were taken [13,17]. For hydrogenation, the original materials were annealed at 900 0 C, deformed by rolling by ε =50%, and irradiated by 50MeV α-particles up to a fluence of 5 10 15 cm −2 .…”

Radiation-Induced Effects and Defects in Ti -Ge Alloys

“…Therefore, it is necessary to keep the sample temperature not more than the mentioned, which, in principle, is not an intricate problem. The interstitial atoms in these conditions migrate to the sinks and do not have a considerable influence on the investigation results by positron annihilation methods [3,4].…”

“…Results and discussion. For interpretation purposes of the investigation results the following annihilation parameters were used: F-redistribution of positron annihilation probability between the conductivity and bound electrons, which is extracted from the spectrum of the annihilation radiation angular correlation and the angle F respective to the Fermi momentum [2][3][4]. Kinetics of radiation defects accumulation as a result of the α-particles irradiation of Ti -Ge alloys system was investigated at fluencies of 10 14 ; 3.2×10 14 ; 3.2×10 15 and 10 16 cm -2 .…”