Journal of Materials Science

, Volume 11, Issue 3, pp 510–521 | Cite as

Superplastic deformation of the Pb-Sn eutectic

  • A. E. Geckinli
  • C. R. Barrett
Papers

Abstract

Dynamic observations of grain-boundary sliding during superplastic flow of the Pb-Sn eutectic are reported. These observations confirm the postulate that the dominant deformation mode during superplastic flow is grain-boundary sliding with localized deformation necessary to maintain grain coherency. Extensive grain-boundary sliding is also observed when the strain-rate and/or grain size is outside the superplastic flow regime. Stress relaxation tests were also carried out on the Pb-Sn eutectic. These tests provide data on the activation energy (45±5 kJ mol−1), grain-size dependence (d−3), and stress dependence of superplastic flow in this alloy. A threshold stress of 1.3×106N m−2 for the onset of superplastic deformation is also observed.

Keywords

Polymer Grain Size Activation Energy Flow Regime Stress Relaxation 

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Copyright information

© Chapman and Hall Ltd. 1976

Authors and Affiliations

  • A. E. Geckinli
    • 1
  • C. R. Barrett
    • 1
  1. 1.Department of Materials Science and EngineeringStanford UniversityStanfordUSA

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