A resistometric study of the solution and precipitation of hydrides in unalloyed zirconium

Hydride reorientation in Zircaloy-4 cladding

“…The enhanced effect of thermal cycling on the stress reorientation is, to a certain extent, similar to the phenomenon of hydrogen supercharging in zirconium-based material that can be achieved by repeated heating and cooling [31][32][33]. Supercharging was attributed to the incomplete dissolution of hydride precipitates.…”

A new method to study hydriding processes from the inner surfaces of fuel claddings

“…In the first increasing stage both results follow the same behavior and similar values of the relative resistance change attributed to the H dilution in the a-Zr phase. Using this curve as a reference, the observed resistance change corresponds to %93 ppm in weight of dissolved H. By taking into account the resistance change per atomic fraction at 603 K, reported in the pioneering work of Mishima et al [11], a H concentration of 150 ppm can be estimated. In both cases this point is close to the limit of terminal (or maximum) solid solubility (TSS) %110 ppm for hydrogen for different Zr alloys measured at 633 K [12][13][14].…”

Terminal solid solubility of hydrogen in Zr-alloy pressure tube materials

“…TSS of hydrogen in zirconium alloys is observed to increase with increase in temperature. At ambient temperature TSS of hydrogen in zirconium alloys is less than 1 g/g [44][45][46][47][48][49][50][51][52][53][54][55][56][57]. Hence, at ambient temperature almost all the hydrogen in zirconium alloy will be present as hydride.…”