Abstract
The superplastic deformation of materials has commonly been characterized by the strain rate sensitivity, m, determined from two-dimensional, flow stress against strain rate plots. For material in which flow stress varies with strain or because of microstructural changes due to time at a high temperature, superplastic deformation must be characterized with respect to a three dimensional plot in which strain or time is the third axis. Techniques for generating the necessary plots are indicated and a simple experimental method for determining the suitability of a given material to a particular forming operation is described.
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Kerr, W.R. Flow stress, strain rate, strain relationships in superplastic deformation. J Mater Sci 15, 3104–3108 (1980). https://doi.org/10.1007/BF00550382
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DOI: https://doi.org/10.1007/BF00550382