Effect of mechanically induced modification on TiH2 thermal stability

Zirconium alloys produced by recycling zircaloy tunings

“…All as-milled Zr-Ti mixtures released hydrogen in a two-stage desorption process, with maxima at approximately 520 °C and 730 °C after 5 h of milling. This two-stage behavior could be attributed to the decomposition of TiH 1.97 (stage 1) [18,20,21], followed by the decomposition of ZrH 2 (stage 2) [22,23]. For both Zr:Ti mixtures, the onset desorption temperature of the TPD profiles is shifted by more than 200 °C as milling time increases from 1 h to 5 h. In addition, while the decomposition temperature of TiH 1.97 slightly changes with the milling time and the composition of the starting mixture, the peak position corresponding to the ZrH 2 decomposition clearly shifts to lower temperatures for the Zr:Ti composition from 10 to 30 h of milling (Fig.…”

“…3 and 4) were heated up to 900 °C under a constant flow of Ar, using a ramp of 5 °C min À1 . This temperature was selected on the basis of decomposition temperature reported for each hydride, to ensure complete hydrogen release [18,[20][21][22][23]. The hydrogen desorption behavior of the Zr:Ti mixtures after different milling times was assessed using TPD profiles (Fig.…”