| Summary: | Unsaturated titanium hydride (TiH<sub>X</sub>) powder has high formability and is a promising raw material for titanium-based powder metallurgy. In this work, TiH<sub>2</sub>, TiH<sub>X</sub>, and HDH Ti powders were characterized, the cold compaction behavior of the powders was investigated, and the densification mechanism was analyzed. The TiH<sub>X</sub> was a three-phase mixture containing an α plastic phase and δ and ε brittle phases through Rietveld refinement. The TiH<sub>X</sub> compacts had compressive strength of over 420 MPa (higher than TiH<sub>2</sub> and similar to HDHTi) and relative density of over 80% (higher than TiH<sub>2</sub> and HDH Ti) at 600 MPa. The Gerdemann–Jablonski and Cooper–Eaton equation were used to simulate the powder compaction curves and describe powder compaction behavior. The plastic deformation of TiH<sub>X</sub> powder is greater than TiH<sub>2,</sub> and the particle rearrangement is greater than HDH Ti during cold compaction. Such compaction behavior of TiH<sub>X</sub> causes an excellent green-strength–relative-density combination.
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