Investigation on Recovery and Recrystallization of Al-Si-Al₂O₃ Composites

Abstract:

Al-Si-Al₂O₃ composites were prepared by powder metallurgy with in-situ synthesis technology. The recovery and recrystallization behavior of Al-Si-Al₂O₃ composites which underwent compression and then heat-treatment under different temperature were studied using micro-hardness tester, optical microscope (OM) and scanning electron microscopy (SEM) . The results showed that the hardness of composites increased dramatically after compression, and the sample containing 5wt% Si was increasing more evidently than the sample including 10wt%Si. Heat treatment gradually eliminated work hardening; meanwhile the fact that the hardness of composites trended to decline greatly when subjected to annealing suggested occurrence of recovery and recrystallization inside the composites. Recrystallization nucleation preferentially took place in the region near the particle, while the growth of recrystallized grains can also be hindered owning to the pining effect of particles. Depending on the analysis of microstructure and microhardness, it can be concluded that the recrystallization temperature of Al-wt.5%Si-Al₂O₃ composites was 500°C and the Al-wt.10%Si-Al₂O₃ composites was 525°C.

• Periodical: Advanced Materials Research (Volume 813)
• Pages: 345-350
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.813.345
• Online since: September 2013
• Authors: Xiong Wei Wang, Xiao Song Jiang, De Gui Zhu, Luo Zhang
• Keywords: Al-Si-Al₂O₃ Composites, Plastic Deformation, Recovery, Recrystallization

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