Advertisement

Micro-scale mechanics of the surface-nanocrystalline Al-alloy material

  • Yueguang Wei
  • Chen Zhu
  • Xiaolei Wu
Article
  • 42 Downloads

Abstract

Based on the microscopic observations and measurements, the mechanical behavior of the surface-nanocrystallized Al-alloy material at microscale is investigated experimentally and theoretically. In the experimental research, the compressive stress-strain curves and the hardness depth curves are measured. In the theoretical simulation, based on the material microstructure characteristics and the experimental features of the compression and indentation, the microstructure cell models are developed and the strain gradient plasticity theory is adopted. The material compressive stress-strain curves and the hardness depth curves are predicted and simulated. Through comparison of the experimental results with the simulation results, the material and model parameters are determined.

Keywords

surface-nanocrystallized material Al-alloy microstructure cell model size effect 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Valiez, R. Z., Korznikov, A. V., Mulyukov, R. R., Structure and properties of ultrafine-grained materials produced by severe plastic deformation. Materials Science and Engineering, 1993, A168: 141.Google Scholar
  2. 2.
    Valiev, R. Z., Ivanisenko, Y. V., Rauch, E. F. et al., Structure and deformation behavior of armco iron subjected to severe plastic deformation, Acta Mater., 1996, 44: 4705.CrossRefGoogle Scholar
  3. 3.
    Valiev, R. Z., Islamgaliev, R. K., Enhanced superplasticity of ultrafine-grained alloys processed by severe plastic deformation. Materials Science Forum, 1999, 304: 39.CrossRefGoogle Scholar
  4. 4.
    Valiev, R. Z., Islamgaliev, R. K., alexandrov, I. V., Bulk nanostructured materials from severe plastic deformation, Progress in Materials Science, 2000, 45: 103.CrossRefGoogle Scholar
  5. 5.
    Lu, K., Lu, J., Surface nanocrystallization (SNC) of metallic materials-presentation of the concept behind a new approach. J. Mater. Sci & Tech. 1999, 15: 193MATHADSGoogle Scholar
  6. 6.
    Fleck, N. A., Hutchinson, J. W., Strain gradient plasticity, in Hutchinson, J. W., Wu, T. Y. ed. Advances in Applied Mechanics, 1997, 33: 295.Google Scholar
  7. 7.
    Gao, H., Huang, Y., Nix, W. D. et al., Mechanism-based strain gradient plasticity-I. Theory. J. Mech. Phys. Solids, 1999, 47: 1239.MATHCrossRefADSMathSciNetGoogle Scholar
  8. 8.
    Chen, S., Wang, T. C., A new hardening law for strain gradient plasticity, Acta Mater., 2000, 48: 3997.CrossRefGoogle Scholar
  9. 9.
    Begley, M., Hutchinson, J. W., The mechanics of size-dependent indentation, J. Mech. Phys. Solids, 1998, 46: 1029.Google Scholar
  10. 10.
    Wei, Y., Wang, X., Wu, X. et al., Theoretical and experimental researches of size effect in micro-indentation test, Science in China (Ser. A), 2001, 44(1): 74.CrossRefGoogle Scholar
  11. 11.
    Wei, Y., Wang, X., Zhao, M. et al., Size effect and geometrical effect of solids in micro-indentation test, Acta Mechanica Sinica, 2003, 19(1): 59.CrossRefGoogle Scholar
  12. 12.
    Wu, X., Tao, N., Hong, Y., et al., Microstructure and evolution of mechanically-induced ultrafine grain in surface layer of Al-alloy subjected to USSP, Acta Mater., 2002, 50: 2075.CrossRefGoogle Scholar
  13. 13.
    Ma, X. L., Wang, W., Yang, W., Simulation for surface self-nanocry stallization under shot peening. Acta Mechanica Sinica, 2003, 19(2): 172.CrossRefGoogle Scholar
  14. 14.
    Zhu, C., Microstructure characteristics and microscale mechanics of the surface-nanocrystalline Al-alloy material, Master Degree Thesis (in Chinese), Institute of Mechanics, Chinese Academy of Sciences, June, 2002.Google Scholar
  15. 15.
    Compiling Committee of the Engineering Materials Manual, Engineering Materials Manual (in Chinese), Beijing: China Standard Publisher, 1989.Google Scholar
  16. 16.
    Wei, Y., Hutchinson, J. W., Steady-state crack growth and work of fracture for solids characterized by strain gradient plasticity. J. Mech. Phys. Solids, 1997, 45(8): 1253.MATHCrossRefADSMathSciNetGoogle Scholar
  17. 17.
    Hill, R., Continuum micro-mechanics of elastoplastic polycrystals, J. Mech. Phys. Solids, 1965, 13: 89.MATHCrossRefADSGoogle Scholar

Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Yueguang Wei
    • 1
  • Chen Zhu
    • 1
  • Xiaolei Wu
    • 1
  1. 1.LNM, Institute of MechanicsChinese Academy of SciencesBeijingChina

Personalised recommendations