The hot working behaviour of a 2618 aluminium alloy was investigated in torsion at temperatures ranging from 200 to 500 degrees C, The peak flow stress was related to temperature and strain rate by means of the conventional constitutive equations normally used for high temperature deformation of metals. On the basis of a preliminary investigation on the heat treatment response of the alloy, a subsequent study on the warm working of the material in the solution treated condition was carried out. Comparison between the results obtained at temperatures of 200 and 300 degrees C indicated that deformation of the solution treated alloy resulted in an increase flow stress and in a reduced ductility.