Journal of Materials Science

, Volume 18, Issue 7, pp 2063–2070 | Cite as

Evaluation of microstructural instability during the differential strain rate test of a superplastic alloy

  • B. P. Kashyap
  • G. S. Murty


Stress (σ)-strain rate (\(\dot \varepsilon \)) data of banded and elongated grain microstructures of the Pb-Sn eutectic alloy were analysed over 298 to 443 K to evaluate microstructural instability during differential strain rate tests in the superplastic region. With reference to a stable equiaxed microstructure exhibiting uniqueσ-\(\dot \varepsilon \) relation, banded structure is more susceptible to strain hardening while the elongated grain microstructure exhibits either strain softening or strain hardening depending on the test temperature. This flow behaviour is considered in terms of a change in grain size, represented by the cube root of the grain volume. Activation energy for grain growth calculated from the differential strain rate test data indicates that the activation energy depends on strain rate and type of microstructure.


Polymer Grain Size Microstructure Activation Energy Test Data 
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Copyright information

© Chapman and Hall Ltd. 1983

Authors and Affiliations

  • B. P. Kashyap
    • 1
  • G. S. Murty
    • 1
  1. 1.Department of Metallurgical EngineeringIndian Institute of TechnologyKanpurIndia

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