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Abstract
A simple instability condition based on Ziegler's continuum principles as applied to large plastic flow is extended to define the deformation processing maps that delineate 'safe' and 'non-safe' hot working conditions. Processing maps were developed utilising the measured flow stress data of nickel based powder metallurgy superalloys in a constitutive equation. The applicability of the processing maps developed has been examined by comparing with the reported microstructural observations of deformed compression specimens. Optimum hot working conditions for the materials are suggested, based on the maximum values of the strain rate sensitivity index.