Al2O3 첨가에 따른 7xxx계 알루미늄 소결체의 시효특성 변화

초록

Aging characteristics and mechanical properties of commercial 7xxx series Al composites were investigated from viewpoint of ceramic contents. After sintering process, sintered densities of blended and composite powder were 95 and 97%, respectively. Each part was solution-treated at 475℃ for 60 min and aged 175℃. And two-step aging was also performed form 120℃ to 175℃. The aging behavior of the sintered composite powder was different from that of sintered blended powder. The peak aging time of the composite was rapid as well due to strain. Before aging, mechanical properties of sintered composite powder was significantly higher than that of sintered blended powder. These increments of properties were directly affected by ceramic particles. However, after aging, incremental rate of mechanical properties was slowed in the composite.

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