Abstract: The hot deformation behavior of AA6063 aluminium　alloy has been investigated by means of compression tests at　temperatures between 400 and 520℃, and strain rates ranging from 2.5 to 10　s-1. Owing to the barreling, the　theoretical model on the basis of Hill's general method is used to　calculate the flow stress of a cylindrical specimen under uniaxial　simple compression so as to consider the friction effect at the　die-specimen interface. A method of evaluating the friction　coefficient by combining compression tests with the finite element　method is presented. The real flow behavior of AA6063 aluminium　alloy can be described with sinh-Arrhenius equation. The hot　deformation activation energy Q derived from the corrected stress and strain data is 232.350　kJ/mol.

Key words: Barreling, Compression test