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Microstructures and Mechanical Properties of In Situ Al2O3/Al-Si Composites Fabricated by Reaction Hot Pressing

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Abstract

Three in situ formed Al2O3/Al-Si composites with a different volume fraction of 10, 20, and 30 vol pct were fabricated using low energy ball milling and reaction hot pressing. The effect of reinforcement volume fraction on the microstructure and mechanical properties were studied. When the volume fraction was 30 vol pct, a massive primary Si (~130 µm) along with an increase of Al2O3 (~2 µm) was observed. The YS, UTS, and Brinell hardness of the composites were significantly higher than the aluminum matrix. Mechanisms governing the tensile fracture process are discussed.

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This work is financially supported by the National Natural Foundation of China. (Project No.: 51201047).

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Authors and Affiliations

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

    El Oualid Mokhnache (Doctor Candidate), G. S. Wang (Associate Professor), L. Geng (Professor) & L. J. Huang (Associate Professor)

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  1. El Oualid Mokhnache
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  2. G. S. Wang
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  3. L. Geng
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  4. L. J. Huang
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Correspondence to G. S. Wang.

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Manuscript submitted March 9, 2014.

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Mokhnache, E.O., Wang, G.S., Geng, L. et al. Microstructures and Mechanical Properties of In Situ Al2O3/Al-Si Composites Fabricated by Reaction Hot Pressing. Metall Mater Trans B 45, 1965–1969 (2014). https://doi.org/10.1007/s11663-014-0203-z

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