Abstract
Fine-grained superplastic α-β Ti-6Al-4V alloy (where the alloy composition is given in approximate weight per cent) was deformed in the temperature range 750–925°C and at strain rates of 10 −5 −2 × 10 −3 s −1. The results indicate that an increase in the deformation temperature or a decrease in the deformation rate is followed by an increase in the value of the strain-hardening index. In such a situation the stress-strain rate relation can no longer be represented by the conventional power law formulation without evaluating the effect of strain. The common assumption that a large value of the (apparent) strain rate sensitivity parameter is associated with a large amount of superplastic ductility may not be tenable under test conditions where a strain-hardening or strain-softening effect is noticeable.
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