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Microstructure and Mechanical Properties of Ll2-Structure Alloys Based on Al3Zr

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Abstract

The tetragonal compound Al3Zr can be transformed into the cubic Ll2 structure by additions of Cr, Fe, Ni or Cu. This result is interpreted in terms of Pettifor’s structure map. The transformation is accompanied by substantial softening. The significant porosity of cast buttons which develops during the homogenization required to produce the Ll2 structure is attributed to the Kirkendall effect. Al-5.5Fe-25Zr (at. %) specimens with the Ll2 structure can be deformed at room temperature in compression, and their yield stress has been determined as a function of temperature. Al-Fe-Zr is nevertheless a brittle material. This is illustrated for Al-Fe-V-Zr Ll2-structure compound, the fracture toughness of which is only slightly higher than that of sintered SiC. Evidence is presented to suggest that Ll2 formation is accompanied by an increase in toughness. Significant improvements in the mechanical properties of Al3Zr-type alloys may possibly be achieved by improved processing.

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References

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

    Article  CAS  Google Scholar 

  2. Proceedings of the Materials Research Society Symposium on High-Temperature Ordered Intermetallic Compounds, edited by C. C. Koch, C. T. Liu and N. S. Stoloff (Materials Research Society, Pittsburgh, PA, 1985), Vol. 39.

  3. Proceedings of the Materials Research Society Symposium on High-Temperature Ordered Intermetallic Alloys II, edited by N. S. Stoloff, C. C. Koch, C. T. Liu and O. Izumi (Materials Research Society, Pittsburgh, PA, 1987), Vol. 81.

  4. T. Nose and T. Fujii, J. Amer. Ceram. Soc. 71, 328 (1988).

    Article  CAS  Google Scholar 

  5. H. Tada, P. C. Paris and G. R. Irwin, “The Stress Analysis of Cracks Handbook,” 2nd edition, Paris Production Inc. (and Del Research Corporation), St. Louis, MO, 1985.

  6. A. Raman and K. Schubert, Z. Metallkde. 56, 99 (1965).

    CAS  Google Scholar 

  7. D. G. Pettifor, New Sci., No. 5, 48 (1986).

    Google Scholar 

  8. D. G. Pettifor, J. Phys. C 19, 285 (1986).

    Article  CAS  Google Scholar 

  9. P. Vlllars and L. D. Calvert, Pearsons Handbook of Crystallographic Data for Intermetallic Phases, American Society for Metals, Metals Park, OH, 1985, Vol. I, p. 707.

  10. K. S. Kumar and J. R. Pickens, Scr. Metall. 22, 1015 (1988).

    Article  CAS  Google Scholar 

  11. J. H. Schneibel, P. F. Becher and J. A. Horton, J. Mater. Res. 3, 1272 (1988).

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box 2008, 37831, Oak Ridge, TN, USA

    J. H. Schneibel & W. D. Porter

Authors
  1. J. H. Schneibel
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  2. W. D. Porter
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Schneibel, J.H., Porter, W.D. Microstructure and Mechanical Properties of Ll2-Structure Alloys Based on Al3Zr. MRS Online Proceedings Library 133, 335 (1988). https://doi.org/10.1557/PROC-133-335

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