Influence of Compaction Conditions on the Foamability of AlSi8Mg4 Alloy

摘要: Aluminum AlSi8Mg4 alloy foams were produced by the powder compact foaming route using different parameters for uniaxial compaction step. Compaction time, pressure, and temperature varied found to influence both density of foamable precursor peak expansion reached during foaming. While cannot be related any single pressing parameter alone in a simple way, clear dependence on was found. Densification relative between 97.5 99 pct yielded volume expansions foam up 880 pct. Lower densities result weaker foaming, due insufficient encapsulation blowing agent; addition, we surprised find that higher densification also has an adverse effect expansion, most likely elimination nucleation centers or entrapped compressed air. Precursor microstructures analyzed identify mechanisms leading observed expansion.