Effects of particle volume fraction on aging behavior of alumina particle dispersed Al-Cu-Mg alloy composite materials.

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Abstract
Aging behavior of alumina particle dispersed Al-Cu-Mg alloy composite materials containing various amount of alumina, was investigated by means of Vickers micro hardness test and transmission electron microscopy. GPB zone and S' intermediate precipitates were observed on aging at 423K in 2 vol%Al2O3/Al-Cu-Mg composite material, while GP zone and θ' intermediate precipitates appeared at the same aging condition in 6 and 8 vol%Al2O3/Al-Cu-Mg composite materials. A plolonged aging time was needed to reach a maximum hardness with increasing Al2O3 content. The maximum hardness decreased with increasing Al2O3 content in the case where the GPB zone and S'intermediate phases coexisted. On the other hand, in the case where GP zone and θ' intermediate phase coexisted, the values of maximum hardness were almost independent of Al2O3 content. At aging temperature of 473K, almost all precipitates were S' intermediate phase in 2 and 4 vol%Al2O3/Al-Cu-Mg composite materials. In these specimens, almost same and relatively shorter time was needed to reach a maximum hardness. While, in 6 and 8 vol%Al2O3/Al-Cu-Mg composite materials in which θ' intermediate phase exists, the maximum hardness values were lowered and longer aging time was needed.

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