In the metalloid got in the lattice-space as interstitial structure of the titanium-metal, hydrogen does not influence on the strength and hardness, but on the impact.
In the case of using as the parts of a machine, the reduction of the absorptiom level which depends on the impact force is very serious, even when a very small quantity of hydrogen (for example, 0.3-0.5 At. -%).
Have the hatchings on microphotograph connection with this reduction, or not?
To settle this quetion, I suggest an idea that "the pure titanium-metal has a face-centered cubic lattice phase between the body contered cubic lattice phase and the hexagonal close packed lattice phase".
This face-centered cubic lattice comes to existence at about 600°C.
According to the quantity of hydrogen contained titanium-metal, this transition from the face-centered cubic lattice to hexagonal close packed lattice is checked, this check induce the titanium-alloy to reduce the absorption level and to appear the hatching.
