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Evaluation of microstructural instability during the differential strain rate test of a superplastic alloy
Published in Kluwer Academic Publishers
Volume: 18
Issue: 7
Pages: 2063 - 2070
Stress (σ)-strain rate ( {Mathematical expression}) 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 unique σ- {Mathematical expression} 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. © 1983 Chapman and Hall Ltd.
About the journal
JournalJournal of Materials Science
PublisherKluwer Academic Publishers