Skip to main content
Log in

Effect of Preoxidation and Grain Size on Ductility of a Boron-Doped Ni3Al at Elevated Temperatures

  • Published:
MRS Online Proceedings Library Aims and scope

Abstract

The ductility of preoxidized Ni3Al (Ni-23Al-0.5Hf-0.2B, at.%) specimens with various grain sizes (17∼193 μm) was evaluated by means of tensile tests at 600 and 760°C in vacuum. It was found that the preoxidation does not affect the ductility of the finest-grained material at either temperature, whereas it causes severe embrittlement in the largest-grained material, especially at 760°C. A continuous, thin Al-rich oxide layer, which forms on the fine-grained samples, protects the underlying alloy from oxygen penetration, preventing any loss of ductility, whereas the nickel-rich oxide which forms on the large-grained samples allows oxygen to penetrate along grain boundaries, causing severe embrittlement. The grain boundaries act as short-circuit paths for rapid diffusion of aluminum atoms from the bulk to the surfaces, and this is responsible for the difference in oxidation behavior between fine- and large-grained materials. The embrittlement of large-grained samples can be eliminated through control of oxide formation on Ni3Al surfaces.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. C. T. Liu, C. L. White and E. H. Lee, Scripta Metall. 19, 1247 (1985).

    Article  CAS  Google Scholar 

  2. C. T. Liu and C. L. White, Acta Metall. 35, 643 (1987).

    Article  CAS  Google Scholar 

  3. A. I. Taub, K. -M. Chang and C. T. Liu, Scripta Metall. 20, 1618 (1986).

    Google Scholar 

  4. M. Takeyama and C. T. Liu, Acta Metall. 36, 1241 (1988).

    Article  CAS  Google Scholar 

  5. T. P. Weihs, V. Zinoviev, D. V. Viens and E. M. Schulson, Acta Metall. 35, 1109(1987).

  6. A. Choudhury, C. L. White and C. R. Brooks, Scripta Metall. 20, 1061 (1986).

    Article  CAS  Google Scholar 

  7. L. E. Davis, N. C. MacDonald, P. W. Palmberg, G. E. Riach and R. E. Weber, Handbook of Auger Electron Spectroscopy, Perkin-Elmer Corporation, Eden Prairie, Minn (1978).

  8. M. Takeyama and C. T. Liu, unpublished results, Oak Ridge National Laboratory (1988).

  9. C. S. Giggins and F. S. Pettit, TMS-AIME 245, 2509 (1969).

    CAS  Google Scholar 

  10. G. J. Yurek, D. Eisen and A. Garratt-Reed, Metall. Trans. A 13A, 473 (1982).

    Article  CAS  Google Scholar 

  11. F. S. Pettit, TMS-AIME 239, 1296 (1967).

    CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Takeyama, M., Liu, C.T. Effect of Preoxidation and Grain Size on Ductility of a Boron-Doped Ni3Al at Elevated Temperatures. MRS Online Proceedings Library 133, 293 (1988). https://doi.org/10.1557/PROC-133-293

Download citation

  • Published:

  • DOI: https://doi.org/10.1557/PROC-133-293

Navigation