Observation of Tritium Distribution in V-4Cr-4Ti alloy by Tritium Radioluminography.

Tritium distribution in V-4 mass%Cr-4 mass%Ti alloy has been observed by the tritium radioluminography, and the relation between the tritium distribution and the constituent elements of the alloy have been investigated. In the as-east specimen, tritium concentration has been higher in the titanium enriched region, that is, the local tritium concentrations at the lower and higher titanium region are 156 and 202 mol ppb, respectively. The tritium distribution has shown a strong correlation with the titanium segregation in the interdendritic region, In the heat treated specimen, the tritium distribution has been rarely affected by the interdendritic titanium segregation. Tritium concentration at the central area and at the surrounding area in the specimen surface have been 209 and 147 mol ppb, respectively. It has been thought that this accumulation of tritium to the central area is caused by the Gorsky effect which generated due to the constraint condition of the stress field in the plate shaped specimen. In the heat treated specimen, the tritium distribution has been more strongly affected by the shape of the specimen than by the titanium segregation in it.