Advanced Engineering Materials
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Cover Picture: The Role of Oxidation During Compaction on the Expansion and Stability of Al Foams Made Via a PM Route (Adv. Eng. Mater. 6/2006)
The foam expansion and collapse behaviour for hot compacted Al-TiH2 precursors has been shown to be driven by the oxidation of the Al powder and the premature loss of gas from the TiH2 foaming agent during the compaction process. At 550 °C, oxidation is rapid, and gas loss from the hydride is extensive leading to poor expansion.