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The role of lattice mismatch in heterogeneous nucleation of pure Al on Al2O3 single-crystal substrates with different termination planes

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Abstract

Al solidification on Al2O3 single-crystal substrates with (0001) and (11\( \overline{2} \)0) termination surfaces was performed to investigate whether the lattice mismatch can influence the heterogeneous nucleation when the same kind of substrate was employed. Nucleation undercooling was measured via differential scanning calorimeter to present the nucleation potency of Al on selected substrates. The measured results show that the lower undercooling was achieved in Al/Al2O3(11\( \overline{2} \)0), which means that the Al has a higher nucleation potency on Al2O3(11\( \overline{2} \)0) substrates. This is consistent with the calculated lattice misfit of Al/Al2O3(0001) and Al/Al2O3(11\( \overline{2} \)0) based on Bramfitt two-dimensional model because the lowest lattice misfit of Al/Al2O3(11\( \overline{2} \)0) is less than that of Al/Al2O3(0001). Moreover, the corresponding orientation relationships at the interface achieved by high-resolution transmission electron microscopy are almost the same with the predicted one from lattice misfit calculation. It is proved that the lattice misfit does affect the heterogeneous nucleation even the melted metals nucleated on the substrates made of the same kind of material.

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Acknowledgements

The authors thank J. Peng for stimulating discussions and TEM examination, X. Liang for FIB analysis and the Instrumental Analysis and Research Center of SHU. This work was supported by the National Natural Science Foundation of China (Grant Nos. 51320105003, 51704192, U1760204) and the Science and Technology Commission of Shanghai Municipality (Grant No. 15520710800).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shangda Road 99, Shanghai, 200436, People’s Republic of China

    Dingpu Wang, Yanping Shen, Jie Sun, Cheng Sheng, Yunhu Zhang & Qijie Zhai

  2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shangda Road 99, Shanghai, 200436, People’s Republic of China

    Yunhu Zhang & Qijie Zhai

  3. Materials Genome Institute, Shanghai University, Shangda Road 99, Shanghai, 200436, People’s Republic of China

    Wang Chang & Qijie Zhai

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  1. Dingpu Wang
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  2. Wang Chang
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Correspondence to Yunhu Zhang.

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Wang, D., Chang, W., Shen, Y. et al. The role of lattice mismatch in heterogeneous nucleation of pure Al on Al2O3 single-crystal substrates with different termination planes. J Therm Anal Calorim 137, 791–797 (2019). https://doi.org/10.1007/s10973-018-07990-z

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