Advertisement

Journal of Materials Science

, Volume 9, Issue 2, pp 229–239 | Cite as

The temperature-dependence of the mechanical properties of unidirectionally solidified silver-germanium eutectic

  • W. R. Krummheuer
  • H. Alexander
Papers

Abstract

Work-hardening curves of the unidirectionally solidified silver-germanium eutectic have been determined by tensile deformation between room temperature and 615° C. The transition stress, σ0 between elastic and plastic deformation of the germanium platelets, exhibits the same temperature dependence (σ0 ∼ exp Q/KT) over the whole temperature range. σ0 is determined, however, by two effects: the temperature-dependent critical shear stress of germanium and the lowering of the shear strength, τ, of the phase interfaces. Estimates of τ yield 14 kg mm−2 at room temperature and <0.12 kg mm−2 at 615° C. At low temperatures (<400° C), the composite fracture is initiated by the fracture of “fibres” (platelets), whereas at higher temperatures, the matrix fails first. As long as the interface shear strength is sufficiently large, the composite fracture is retarded resulting in a pronounced maximum of the fracture strain at 550° C.

Keywords

Polymer Mechanical Property Shear Stress Plastic Deformation Shear Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. Hellawell, Progr. Mat. Sci. 15 (1970) 3.Google Scholar
  2. 2.
    M. G. Day and A. Hellawell, Proc. Roy. Soc. Lond. A305 (1968) 473.Google Scholar
  3. 3.
    A. Hellawell, Trans. Met. Soc. AIME 293 (1967) 1049.Google Scholar
  4. 4.
    I. Miura and H. Hamanaka, J. Jap. Inst. Metals 32 (1968) 898.Google Scholar
  5. 5.
    W. R. Krummheuer and H. Alexander, Z. Metallk 62 (1971) 129.Google Scholar
  6. 6.
    M. Hansen and K. Anderko, “Constitution of Binary Alloys”, 2nd Edn. (McGraw-Hill, New York Toronto, London, 1958).Google Scholar
  7. 7.
    H. Alexander and P. Haasen, Solid State Phys. 22 (1968) 28.Google Scholar
  8. 8.
    G. Reinacher, Z. Metallk. 48 (1957) 162.Google Scholar
  9. 9.
    A. Kelly and G. J. Davis, Met. Rev. 10 (1965) 1.Google Scholar
  10. 10.
    A. Kelly, “Strong Solids” (Clarendon Press, Oxford, 1966).Google Scholar
  11. 11.
    A. Kelly and W. Lilholt, Phil. Mag. 19 (1969) 311.Google Scholar
  12. 12.
    R. Kossowsky, W. L. Johnston and B. J. Shaw, Trans. Met. Soc. AIME 245 (1969) 1219.Google Scholar
  13. 13.
    P. Neumann and P. Haasen, Phil. Mag. 20 (1970) 285.Google Scholar
  14. 14.
    M. R. Pinnel and A. Lawley, Met. Trans. 1 (1970) 1337.Google Scholar
  15. 15.
    H. B. Huntington, Solid State Phys. 7 (1958) 213.Google Scholar
  16. 16.
    S. Trojanova, private communication.Google Scholar
  17. 17.
    E. R. Thompson, D. A. Koss and D. C. Chesnutt, Met. Trans. 1 (1970) 2807.Google Scholar
  18. 18.
    D. A. Koss and S. M. Kopley, ibid 2 (1971) 1557.Google Scholar
  19. 19.
    E. A. Thompson, private communication.Google Scholar
  20. 20.
    J. Bojowald, Diploma thesis, Köln 1972.Google Scholar
  21. 21.
    G. Garmong and L. A. Shephard, Met. Trans. 2 (1971) 175.Google Scholar
  22. 22.
    A. Kelly and W. R. Tyson, J. Mech. Phys. Solids 13 (1965) 329.Google Scholar
  23. 23.
    J. R. Patel and A. R. Chaudhuri, J. Appl. Phys. 34 (1963) 788.Google Scholar
  24. 24.
    J. Albrecht, private communication.Google Scholar
  25. 25.
    G. A. Cooper and A. Kelly, J. Mech. Phys. Solids 15 (1967) 279.Google Scholar
  26. 26.
    S. Floreen, H. W. Hayden and R. M. Pilliar, Trans. Met. Soc. AIME 245 (1969) 2529.Google Scholar
  27. 27.
    J. P. Cahoon and H. W. Paxton, ibid 245 (1969) 1401.Google Scholar
  28. 28.
    C. A. Calow and A. Moore, J. Mater. Sci. 7 (1972) 543.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1974

Authors and Affiliations

  • W. R. Krummheuer
    • 1
  • H. Alexander
    • 1
  1. 1.Abteilung für Metallphysik im II. PhysikalischenInstitut der Universität KölnW. Germany

Personalised recommendations