Abstract
An innovative approach in blended elemental powder metallurgy (PM) of titanium and titanium alloys is described. Its key feature consists of using titanium hydride powder, resulting in a better balance of mechanical properties as a result of lower residual porosity, lesser contamination, and finer microstructure compared with the use of titanium metal powder. The fundamental advantages of titanium hydride–based PM are explained, including the specific compaction mechanism, activated sintering due to a sequence of phase transformations accompanying dehydrogenation, and reactions of surface-located impurities with atomic hydrogen. Efforts to scale up this approach to a commercial level and make it capable to solve the cost–performance dilemma of titanium PM are demonstrated. They include development of new methods for low-cost titanium hydride powder production and its cost-effective processing.
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