Abstract
The suitability of compaction equations commonly used in PM was investigated for the modelling of TiH2 powder compaction. Compressibility data of TiH2 powder fractions (<45, <150 and <355 μm) were obtained up to 800 MPa and fitted to the Heckel equation, as well as to the models of Gerdemann and Jablonski and Cooper and Eaton. Although a partial correlation was observed for the Heckel equation, the model provided a consistent approximation of TiH2 powder yield strength. An accurate fit was observed for the Gerdemann and Jablonski equation; however, considering the brittleness of TiH2, a more realistic depiction of the physical process was verified from the Cooper and Eaton model. By the addition of an exponential term to the original equation an excellent fit was attained, and compaction of TiH2 powders could be appropriately described according to the mechanisms of initial density, particle rearrangement, fragmentation and plastic deformation.
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