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Nano-TiB2 reinforced ultrafine-grained pure Al produced by flux-assisted synthesis and asymmetrical rolling

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Abstract

In situ nano-TiB2 reinforced ultrafine-grained (UFG) Al composites were prepared via combined processes of flux-assisted synthesis (FAS) and asymmetrical rolling (ASR). The UFG Al composite with an ASR reduction ratio of 97% exhibits an average matrix grain size of 380 nm and an average TiB2 particulate size of 50 nm. Dislocation density in the composites is higher than that corresponding to the high purity (99.99 wt%) Al under identical processing conditions. The yield and ultimate tensile strength values of the UFG Al composites processed with an ASR reduction ratio of 97% are approximately 9 and 5 times higher relative to those of the initial coarse-grained Al, respectively. Moreover, the UFG Al composite with an ASR reduction ratio of 97% exhibits a higher elongation than that corresponding to the UFG pure Al under identical processing conditions, suggesting that nanoparticulates contribute to the overall plastic deformation when the matrix grains are refined to the UFG regime. Moreover, analysis of the strengthening behavior reveals no clear evidence that Orowan strengthening contributes significantly to the overall yield strength of the Al nanocomposites studied herein.

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ACKNOWLEDGMENTS

The authors (ZL, DC, HW, and AS) would like to acknowledge support from the National Natural Science Foundation of China (50671062) and the Aerospace Foundation of Shanghai (HTJ10-17). The financial support (ZL and EJL) from the US National Science Foundation (NSF DMR-1210437) is also gratefully appreciated. Furthermore, the author (ZL) would like to thank the financial support from the China Scholarship Council (No. 201306230030).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Zhiming Li, Dong Chen, Haowei Wang & Aidang Shan

  2. Department of Chemical Engineering and Materials Science, University of California, Davis, California, 95616, USA

    Zhiming Li & Enrique J. Lavernia

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  1. Zhiming Li
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  2. Dong Chen
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  4. Enrique J. Lavernia
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Correspondence to Zhiming Li or Dong Chen.

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Li, Z., Chen, D., Wang, H. et al. Nano-TiB2 reinforced ultrafine-grained pure Al produced by flux-assisted synthesis and asymmetrical rolling. Journal of Materials Research 29, 2514–2524 (2014). https://doi.org/10.1557/jmr.2014.280

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