Observation of hydrogen distribution in V-5 mol%Fe alloy by tritium radioluminography

Tritium radioiuminography has been applied to the quantitative observation of hydrogen distribution in a V-5 mol%Fe alloy. Hydrogen distribution in th e specimen has been found to be non-uniform. By comparing the hydrogen dist ribution with iron-map ping image obtained from a wavelength dispersive X-r ay microanalyzer (WDX), it has been found that the hydrogen distribution co rrelates with iron segregation formed in the are-melting specimen. The cros s sectional observation of the hydrogen distribution has shown that the hyd rogen concentration depends on the iron concentration in the specimen. The hydrogen concentration decreases gradually as iron concentration increases from 3 mol% to 4.3 mol%. Using both the radioluminography and WDX, simultan eously, it has been found that the relation between the local hydrogen conc entration and the alloy composition in the specimen can be obtained.