Influence of hydrogenation on the physical and pressing properties of TC4 alloy powder

The influences of hydrogenation on the particle morphology and surface state, microhardness, particle microstructure, phase component and pressing property of TCA alloy powder were studied by means of SEM, powder inlaid, XRD and die forming. The results show that hydrogenated TCA alloy powder possesses irregular morphology, which is composed of bright a phase and dark β phase and exhibits lamellar structure, needle-like and lath-shaped structure. With the increase of hydrogen content, the particle morphology of hydrogenated TCA alloy powder was mostly irregular, but the microhardness showed a decreasing trend, α phase decreased and β phase increased gradually. When the mass fraction of hydrogen was 0.32wt%, α″ phase appeared, and when the mass fraction of hydrogen reached 0.42% or 0.46%, the particle microstructure was lath-shaped (δ-TiH_X) obviously. The compressive property of hydrogenated TCA alloy powder became better, the forming property got worse gradually with increasing hydrogen content, and the pressing property of the powder with a mass fraction of hydrogen of 0.46% is the best.