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Synthesis and Characterization of In Situ (Al2O3–Si)/Al Composites by Reaction Hot Pressing

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In situ (Al2O3–Si)/Al composites with a reinforcement volume fraction of 10% were synthesized from the Al–SiO2 system using low energy ball milling and reaction hot pressing. Differential thermal analysis was used to investigate the reaction mechanisms between SiO2 and Al. X-ray diffraction results revealed that the reaction between Al and SiO2 took place completely at 900 °C with a holding time of 2 h, thereby forming Al2O3 and Si. Scanning electron microscopic, energy dispersive X-ray spectroscopic, and transmission electron microscopic (TEM) results showed that the in situ synthesized Al2O3 and Si particles, whose sizes are less than 2 µm, were polygonal in shape and dispersed uniformly in the matrix. Moreover, Al2O3 particle size showed a tendency to increase from ~2 to ~6 µm when the synthesis temperature was increased. Furthermore, TEM observation showed that the interface between the reinforcements and Al matrix is clean. The yield strength, ultimate tensile strength, and Brinell hardness of the in situ (Al2O3–Si)/Al composite was significantly higher than the aluminum matrix. Mechanisms governing the tensile fracture process are discussed.

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Acknowledgments

This work was financially supported by the National Natural Foundation of China (No. 51201047) and National Basic Research Program of China (No. 2012CB619600).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    El Oualid Mokhnache, Guisong Wang, Lin Geng, Balasubramaniam Kaveendran & Lujun Huang

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  1. El Oualid Mokhnache
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  2. Guisong Wang
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  3. Lin Geng
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  4. Balasubramaniam Kaveendran
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  5. Lujun Huang
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Correspondence to Guisong Wang.

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Mokhnache, E., Wang, G., Geng, L. et al. Synthesis and Characterization of In Situ (Al2O3–Si)/Al Composites by Reaction Hot Pressing. Acta Metall. Sin. (Engl. Lett.) 27, 930–936 (2014). https://doi.org/10.1007/s40195-014-0147-y

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  • DOI: https://doi.org/10.1007/s40195-014-0147-y

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