Microstructure and Properties of Titanium Alloys Synthesized from Hydrogenated Titanium Powders

摘要

In present study high dense (99±0.5% relative density) Ti-6Al-4V alloy was synthesized with blended elemental powder metallurgy (BEPM) simplest press-and-sinter approach using hydrogenated titanium powder with different hydrogen content (0.2 to 3.9 wt.%). Microstructure, residual porosity as well as mechanical properties (tensile and fatigue) of synthesized materials were studied as a function of hydrogen content. It was found that chemically homogeneous fine-grained microstructures were obtained independently on hydrogen content. On the other hand, decrease in hydrogen content resulted in slight (up to 2%) increase in porosity. This did not noticeably affect tensile properties, however deteriorated fatigue properties. Mechanical properties of 99% dense materials were matching the level of properties achieved with conventional ingot metallurgy. Post-sintering heat treatments were used to further improve the mechanical properties of alloys.