Ti-22Al-27Nb specimens of different microstructures were exposed to both cathodic and gaseous hydrogen charging. Lattice parameters of the ordered orthorhombic (O) phase and the bcc (β0) phase were determined using X-ray diffractometry. Neither cracks nor microstructural changes were found after cathodic hydrogen charging at 1 A/cm2 for 168 h. No cracking was found after gaseous hydrogen charging (4 bar, 1h) at temperatures below 500°C, and little cracking at temperatures above 500°C as compared to Ti-25Al-10Nb-3V-1Mo. These results suggest that Ti-22Al-27Nb may have good resistance to hydrogen. Gaseous hydrogen charging resulted in changes in the X-ray diffraction pattern, showing that Al15H2Ti15 hydride had been formed.
|Number of pages||9|
|State||Published - 1 Jan 1996|
|Event||Proceedings of the 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials - Moran, WY, USA|
Duration: 11 Sep 1994 → 14 Sep 1994
|Conference||Proceedings of the 1994 5th International Conference on the Effect of Hydrogen on the Behavior of Materials|
|City||Moran, WY, USA|
|Period||11/09/94 → 14/09/94|