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Effect of Spark-Plasma-Sintering Conditions on Tensile Properties of Aluminum Matrix Composites Reinforced with Multiwalled Carbon Nanotubes (MWCNTs)

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Abstract

In this study, aluminum (Al) matrix composites containing 2 wt.% multiwalled carbon nanotubes (CNTs) were fabricated by powder metallurgy using high-energy ball milling (HEBM), spark plasma sintering (SPS), and subsequent hot extrusion. The effect of SPS conditions on the tensile properties of CNT/Al composites was investigated. The results showed that composites with well-dispersed CNTs and nearly full-density CNT/Al can be obtained. During HEBM, CNTs were shortened, inserted into welded Al powder particles, bonded to Al, and still stable without CNT-Al reaction. After consolidation, Al4C3 phases formed in composites under different sintering conditions. With the increase of sintering temperature and holding time, the strength decreased. Conversely, the ductility and toughness noticeably increased. As a result, a good balance between strength (367 MPa in ultimate tensile strength) and ductility (13% in elongation) was achieved in the as-extruded CNT/Al composite sintered at 630°C with a holding time of 300 min.

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Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, Osaka, 567-0047, Japan

    B. Chen, H. Imai, J. Umeda, M. Takahashi & K. Kondoh

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  1. B. Chen
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  2. H. Imai
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  3. J. Umeda
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  4. M. Takahashi
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  5. K. Kondoh
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Correspondence to K. Kondoh.

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Chen, B., Imai, H., Umeda, J. et al. Effect of Spark-Plasma-Sintering Conditions on Tensile Properties of Aluminum Matrix Composites Reinforced with Multiwalled Carbon Nanotubes (MWCNTs). JOM 69, 669–675 (2017). https://doi.org/10.1007/s11837-017-2263-4

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  • DOI: https://doi.org/10.1007/s11837-017-2263-4

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