The Effect of Boron on Microhardness in Ni3 Al Polycrystals

Abstract

In a recent MRS symposium, the effect of boron on grain boundary hardness (GBH) in Ni3Al was reported. Addition of 0.2 at.% of boron decreased the GBH in all three sets of alloys tested (24, 25, and 26 at.% Al). The present paper summarizes the study of the effect of boron on hardness within grains. Boron-induced softening was again observed in grain interiors. However, it occurred only in alloys with 24 and 25 at.% Al, but not in the alloy with 26 at.% Al. An explanation for this behavior is presented.

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References

  1. 1.

    C. T. Liu, C. L. White and J. A. Horton, Acta Metall. 33, 213 (1985).

    CAS  Article  Google Scholar 

  2. 2.

    S. C. Huang, A. I. Taub and K. M. Chang, Acta Metall. 32, 1703 (1984).

    CAS  Article  Google Scholar 

  3. 3.

    I. Baker, B. Huang and E. M. Schulson, Acta Metall. 36, 493 (1988).

    CAS  Article  Google Scholar 

  4. 4.

    E. M. Schulson, T. P. Weihs, I. Baker and H. J. Frost, Acta Metall. 34, 1395 (1986).

    CAS  Article  Google Scholar 

  5. 5.

    X. R. Qian and Y. T. Chou, Materials Lett. 6, 157 (1988), Scripta Metall. 22, 725 (1988).

    CAS  Article  Google Scholar 

  6. 6.

    X. R. Qian and Y. T. Chou, Proc. of the MRS Symposium on Interfacial Structure, Properties, and Design, M. H. Yoo, C. L. Brlant and W. A. T. Clark, eds., Materials Society, Press, Pittsburgh, 1988.

  7. 7.

    E. Pink and R. J. Arsenault, Progr. Mater. Sci. 24, 1 (1979).

    Article  Google Scholar 

  8. 8.

    R. W. Guard and J. H. Westbrook, Trans. AIME 215, 807 (1959).

    CAS  Google Scholar 

  9. 9.

    D. P. Pope and S. S. Ezz. Int. Metall. Rev. 29, 136 (1984).

  10. 10.

    J. J. Gilman, J. Appl. Phys. 36, 3195 (1965).

    CAS  Article  Google Scholar 

  11. 11.

    M. H. Yoo, in Proc. of the MRS Symposium on High Temperature Ordered Intermetallic Alloys II, N. S. Stoloff, C. C. Koch, C. T. Liu and O. Izumi, eds., Materials Society Press, Pittsburgh, 1987, p. 207

  12. 12.

    B. W. Christ. Acta Metall. 17, 17 (1969).

  13. 13.

    Y. Nakada and A. S. Keh, Acta Metall. 16, 903 (1968).

    CAS  Article  Google Scholar 

  14. 14.

    A. Dasqupta, L. C. Smedskjaer, D. G. Legniki and R. W. Siegel, Mater. Lett. 3, 457 (1985).

    Article  Google Scholar 

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Qian, X.R., Chou, Y.T. The Effect of Boron on Microhardness in Ni3 Al Polycrystals. MRS Online Proceedings Library 133, 529 (1988). https://doi.org/10.1557/PROC-133-529

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