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Journal of Materials Science

, Volume 14, Issue 10, pp 2384–2390 | Cite as

Measurement of the effect of microstructural variations on the energy of (Co, Ni)-Cr23 C6 eutectic

  • G. Zambelli
  • W. Kurz
Papers

Abstract

The measurement of sector areas of load-deflection curves in the Tattersall-Tappin test permits evaluation of the fracture energy dissipated by the microstructure during crack propagation. This method has been applied to the oriented pseudo-binary (Co, Ni)-Cr23C6 eutectic alloys which exhibit an irregular, continuous network of brittle carbides within a ductile (Co, Ni, Cr) phase. In spite of the complexity of the microstructure analysed, the method proposed for measuring the fracture energy seems to be capable of revealing the fundamental influence of the size, volume and properties of the phases on the fracture energy of the alloys. An increase in the fracture energy for crack propagation has been observed with: (a) an increase in the size (spacing) of the phases for a constant volume fraction; (b) an increase in the volume fraction of the ductile phase; (c) a progressive increase of the Ni content of the alloy (for values above 5 wt % Ni); the highest values being observed for the pure ternary system: Co-Cr23C6 and Ni-Cr23C6.

Keywords

Carbide Fracture Energy Eutectic Alloy Fracture Path Stable Crack Growth 

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References

  1. 1.
    E. R. Thompson andF. D. Lemkey, “Composite Materials”, Vol. 4, edited by L. J. Broutman, R. H. Krock (Academic Press, New York, 1974) p. 102.Google Scholar
  2. 2.
    G. Zambelli andD. D. Double,J. Mater. Sci. 13 1978) 534.CrossRefGoogle Scholar
  3. 3.
    ASTM: E 399-74, Standard Test Method for Planestrain Fracture Toughness of Metallic Materials (1974).Google Scholar
  4. 4.
    H. G. Tattersall andG. Tappin,J. Mater. Sci. 1 (1966) 296.CrossRefGoogle Scholar
  5. 5.
    J. Nakayama,J. Amer. Ceram. Soc. 48 (1965) 583.CrossRefGoogle Scholar
  6. 6.
    I. Finnie, “An Introduction to Fracture”, Lecture notes (1977) EPF Lausanne, Switzerland.Google Scholar
  7. 7.
    G. Zambelli, Sc. D. Thesis (1976), Ecole Polytechnique Fédérale de Lausanne, Switzerland.Google Scholar
  8. 8.
    L. Remy, F. Lecroisey, A. Pineau,Mém. Sci. Rev. Métall. 7–8 (1973) 589.Google Scholar
  9. 9.
    G. Zambelli andW. Kurz, to be published.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1979

Authors and Affiliations

  • G. Zambelli
    • 1
  • W. Kurz
    • 1
  1. 1.Department of Materials EngineeringFederal Institute of TechnologyLausanneSwitzerland

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