Abstract
The strain-rate sensitivity indexm of the Cu-9.5 wt % Al-4 wt % Fe alloy has been determined by two different procedures: (1) from a rate-change test and (2) from the slopes of the maximum engineering stress/initial strain-rate curve. The discrepancies between the results obtained according to the two different procedures are outlined and discussed.
Besides the necking behaviour during deformation, factors such as (1) changes in the primitive defect structure, (2) large variations ofm over the strain-rate interval covered and (3) grain growth during deformation, are to be considered in explaining the origin of the discrepancies. Dunlop and Taplin's method is considered to be the better of the two procedures used for determiningm, since it introduces fewer errors. In this alloy, graincoarsening is caused by thermal activation as well as by the deformation process itself.
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Ducheyne, P., De Meester, P. Superplastic testing conditions and grain growth. J Mater Sci 9, 109–116 (1974). https://doi.org/10.1007/BF00554760
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DOI: https://doi.org/10.1007/BF00554760