Abstract
The hydrogen absorption and desorption properties of oxidized Ti-6A1-4V alloy were evaluated under a condition of a fusion reactor operation. When the hydrogen pressure and absorption temperature were kept 10 Pa and 673 K for 1 hr, respectively, the absorption amount of hydrogen decreased with increase of the surface oxidation of Ti-6A1-4V alloy. Also the peak temperature of hydrogen desorption shifted to higher temperature, as the increase of surface oxidation. In the alloy oxidized at 873 K, the absorption amount of hydrogen was 1/50 times smaller than that without oxidation, and the desorption temperature was approximately 200 K higher.
When the oxide layer is thicker than 10 nm, the absorption amount of hydrogen can be sufficiently low if the hydro-gen absorption temperature is kept below 773 K.
