An alloy based on Ni 3 (Al, Cr), IC-264, has been isothermally forged in the temperature range 950 ± 1100³C and strain rate range 3610 24 to 3 . 5610 22 s 21 . Stress ± strain curves show ¯ow softening for most forging conditions, suggesting dynamic recrystallisation, as does microstructural examination. Deformation modelling has been carried out using a simple constitutive relationship.MST/4337