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


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.


Polymer Mechanical Property Shear Stress Plastic Deformation Shear Strength 
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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

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