Constitutive equations for the relationship between stress, strain, strain rate, and temperature are an essential input for modelling thermomechanical processing. Hot plane strain compression testing was used to deform commercial purity aluminium, AI-1Mn, and AI-1Mg alloys at temperatures of300, 400, and 500°C and equivalent strain rates of 0·25, 2'5, and 25 S-l, to an equivalent strain of2. Flow stress data obtainedfrom these tests were analysed using the Sah et al. and hyperbolic sine forms of relationships. Values of constants in the constitutive equations were obtained and were shown to provide an accurate description of the experimental stress-strain curves, including the effect of temperature rise due to deformational heating and the effect of changing strain rate. The application and limitations of the relationships are discussed.MST/3536

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