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Synthesis of nanoscale spherical TiB2 particles in Al matrix by regulating Sc contents

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Abstract

In situ TiB2 particles with polyhedral or near-spherical morphology with more high-index crystal planes exposed were prepared by controlling the addition amount of Sc in commercial pure aluminum matrix. As the content of Sc increased, TiB2 morphology transformed from hexagonal platelets to polyhedral or near-spherical morphology with a decrease in particle size. In the present paper, a simple method to prepare near-spherical in situ TiB2 particles in Al matrix was explored and it was found that the reinforcement distribution was improved significantly. The different growth mechanism of TiB2 particles in Al and Al–Sc systems was discussed. The key reason for the morphology evolution was that the Sc was preferentially adsorbed on \(\left( {1\bar 212} \right)\) , \(\left( {11\bar 20} \right)\) , and \(\left( {01\bar 11} \right)\) which would inhibit the growth of these faces effectively and retain a lower-energy state of the polyhedral or quasispherical TiB2 particles in Al–Sc systems.

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Authors and Affiliations

  1. Research and Development Department, Shanghai Aerospace Equipment Manufacturer Limited Company, Shanghai, 200245, China

    Jing Sun & Xuqin Wang

  2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China

    Jing Sun, Lijie Guo, Xiaobo Zhang & Haowei Wang

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  1. Jing Sun
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  2. Xuqin Wang
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  3. Lijie Guo
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  4. Xiaobo Zhang
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Correspondence to Jing Sun.

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Sun, J., Wang, X., Guo, L. et al. Synthesis of nanoscale spherical TiB2 particles in Al matrix by regulating Sc contents. Journal of Materials Research 34, 1258–1265 (2019). https://doi.org/10.1557/jmr.2018.469

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  • DOI: https://doi.org/10.1557/jmr.2018.469

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