Abstract
The effect of internal hydrogen on the microstructural modification of Ti 3Al (α 2) compound was studied by large-angle neutron scattering and transmission electron microscopy. Ti-25 at.% Al(Ti 3Al) specimens were exposed to gaseous hydrogen atmosphere at 600°C that resulted in internal hydrogen concentration of 2000 ppm. The hydrogen-charged alloy consisted of a mixture of α 2 phase and a novel Ti 3AlH phase with the E2 1, (Pm3m) crystal structure. The lattice parameters and atomic arrangement of the Ti 3A1H phase were determined.
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