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Crack Formation in Powder Metallurgy Carbon Nanotube (CNT)/Al Composites During Post Heat-Treatment

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Abstract

After the post heat-treatment (PHT) process of powder metallurgy carbon nanotubes (CNT)/Al composites, micro-cracks were observed in the composites, leading to greatly degraded mechanical properties. To understand and suppress the crack formation, an in situ observation of CNT/Al composites was performed at elevated temperatures. PHT was also applied to various bulk pure Al and CNT/Al composites fabricated under different processes. It was observed that the composites consolidated by hot-extrusion might form micro-cracks, but those consolidated by spark plasma sintering (SPS) showed no crack after PHT. A high-temperature SPS process before hot-extrusion was effective to prevent crack formation. The release of residual stress in severe plastic deformed (SPD) materials was responsible for the cracking phenomena during the PHT process. Furthermore, a good particle bonding was essential and effective to suppress cracks for SPD materials in the PHT process.

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Authors and Affiliations

  1. Graduate School of Engineering, Osaka University, Osaka, 565-0871, Japan

    Biao Chen

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

    Hisashi Imai, Junko Umeda & Katsuyoshi Kondoh

  3. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, People’s Republic of China

    Shufeng Li & Lei Jia

Authors
  1. Biao Chen
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  2. Hisashi Imai
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  3. Shufeng Li
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  4. Lei Jia
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  5. Junko Umeda
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  6. Katsuyoshi Kondoh
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Correspondence to Biao Chen.

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Chen, B., Imai, H., Li, S. et al. Crack Formation in Powder Metallurgy Carbon Nanotube (CNT)/Al Composites During Post Heat-Treatment. JOM 67, 2887–2891 (2015). https://doi.org/10.1007/s11837-014-1246-y

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  • DOI: https://doi.org/10.1007/s11837-014-1246-y

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