  We used by in-situ high energy X-ray diffraction to inestigate the
deformation behavior of Grade 2 commercially pure titanium that was hydrogen
charged to form hydrides. The results showed that the peak broadening in the
diffraction patterns are due to the high internal and interphase stresses
generated within and around hydrides due to the volume expansion induced by the
phase transformation. The hydrides exhibit typical high strength but brittle
secondary phase behavior, which undertakes more elastic strain than matrix and
is the location where cracks are first generated. Interestingly, the
{\delta}-hydrides sustain larger strains than the matrix, especially after the
matrix yields. This study on the deformation mechanism of hydrides in pure
titanium provides insight into the hydride deformation behavior and hydrogen
embrittlement in both titanium and zirconium.

Materials Science