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

  • Dingpu Wang
  • Wang Chang
  • Yanping Shen
  • Jie Sun
  • Cheng Sheng
  • Yunhu ZhangEmail author
  • Qijie Zhai
Article
  • 32 Downloads

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.

Keywords

Heterogeneous nucleation Lattice mismatch Undercooling Single-crystal substrate DSC HRTEM 

Notes

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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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Dingpu Wang
    • 1
  • Wang Chang
    • 3
  • Yanping Shen
    • 1
  • Jie Sun
    • 1
  • Cheng Sheng
    • 1
  • Yunhu Zhang
    • 1
    • 2
    Email author
  • Qijie Zhai
    • 1
    • 2
    • 3
  1. 1.School of Materials Science and EngineeringShanghai UniversityShanghaiPeople’s Republic of China
  2. 2.State Key Laboratory of Advanced Special SteelShanghai UniversityShanghaiPeople’s Republic of China
  3. 3.Materials Genome InstituteShanghai UniversityShanghaiPeople’s Republic of China

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