Hydrogen effect on the morphology and structure of 3D porous titanium in the HFCVD-diamond growth environment

► Hydrogen quickly spread out in the Ti matrix reacting and generating TiH phases. ► The higher the hydrogenation temperature the higher the amount of TiH formation. ► The volume increasing associated with the TiH formation caused tensions in the Ti metallic matrix. ► The TiH increases the Ti surface roughness influencing the grain size reduction.