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Chinese Science Bulletin

, 46:1837 | Cite as

TEM observation of oxidation of CuZnAlMnNi shape memory alloy

  • Yujun Bai
  • Chengwei Lu
  • Guili Geng
  • Longwei Yin
Notes

Abstract

The atmospheric oxidation of a quenched CuZnAlMnNi alloy after ion-polishing was examined by transmission electron microscopy (TEM). It was found that a lot of oxide grains with various sizes yield homogeneously on the surface of the alloy after exposure at room temperature for 90 d. The grains mainly form along the planes of stacking fault, meanwhile, they can also be observed at the stacking fault tetrahedrals or around the dislocation lines. The formation of the oxides gives rise to the reduction of the stacking faults, and even complete disappearance in some zones, which is partly responsible for the decrement of shape memory effect (SME) of the alloy quenched during long-term holding at room temperature.

Keywords

shape memory alloy oxidation stacking fault tetrahedral dislocation line 

References

  1. 1.
    Somerday, M., Comstock, R. J., Wert, J. A., Effect of grain size on the observed pseudoelastic behavior of a CuZnAl shape memory alloy, Metall. Mater. Trans. A, 1997, 28A: 2335.CrossRefGoogle Scholar
  2. 2.
    Eucken, S., Hirsch, J., The effect of textures on shape memory behavior, Mater. Sci. Forum, 1990, 56-58: 487.CrossRefGoogle Scholar
  3. 3.
    Lovey, F. C., Cesari, E., Auguet, C. et al., The influence of γphase precipitates on the martensitic transformation in CuZnAl alloys, Mater. Sci. Forum, 1990, 56-58: 493.Google Scholar
  4. 4.
    Mazzolai, F. M., Coluzzi, B., Costa, C. et al., Martensitic transformation features of CuZnAl alloys during aging, Key Engineering Materials, 1990, 48: 27.Google Scholar
  5. 5.
    Liu, M., Zhang, X. M., Liu, M. Z. et al., Influence of precipitates on the two way shape memory effect, Acta Metall. Sinica, 1997, 10: 166.Google Scholar
  6. 6.
    Liu, W. G., Zhu, M., Wei, Z. G. et al., The influence of morphology and distribution of α phase on the properties of polycrystalline CuZnAl shape memory alloy, Metall. Trans. A, 1992, 23A: 2939.Google Scholar
  7. 7.
    Wu, M. H., Perkins, J., Wayman, C. M., Long range order, antiphase domain structures, and the formation mechanism of α1 (“bainite”) in A CuZnAl alloy, Acta Metall., 1989, 37: 1821.CrossRefGoogle Scholar
  8. 8.
    Bidaux, J. E., Bariloche Centro Atomico, Stabilization of 18R martensite and its effect on martensite to martensite transformation in CuZnAl, Scripta Metall. Mater., 1991, 25: 1895.CrossRefGoogle Scholar
  9. 9.
    Segui, C., Mechanisms of martensite stabilization in CuAlNiMnB alloys, Scripta Metall. Mater., 1995, 32: 565.CrossRefGoogle Scholar
  10. 10.
    Bai Yujun, Shi Qiquan, Geng Guili et al., Formation mechanism of curved martensite structures in Cu-based shape memory alloy, J. Mater. Sci. Technol., 2000, 16: 79.Google Scholar
  11. 11.
    Lovey, F. C., van Tendeloo, G., van Landuyt, J. et al., On the nature of various stacking defects in 18R martensite in Cu-Al alloys, Phys. Stat. Sol. (a), 1984, 86: 553.CrossRefGoogle Scholar
  12. 12.
    Gotthardt, R., Stacking fault formation in a faulted CuZnAl martensite, J. de Physique, 1982, 43: 667.Google Scholar
  13. 13.
    Andrade, M., Chandrasekaran, M., Delaey, L., The basal plane stacking faults in M18R martensite of copper base alloys, Acta Metall., 1984, 32: 1809.CrossRefGoogle Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Yujun Bai
    • 1
  • Chengwei Lu
    • 1
  • Guili Geng
    • 2
  • Longwei Yin
    • 2
  1. 1.Mechanical DepartmentShandong University of Science and TechnologyJi’nanChina
  2. 2.Materials Science and EngineeringShandong UniversityJi’nanChina

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