HIGH-TEMPERATURE CREEP IN MECHANICALLY ALLOYED AL-C-O ALLOYS

Parameters characterizing the creep of four mechanically alloyed alumi nium alloys were compared with those of pure aluminium. It was shown t hat the activation energy and logarithm of preexponential factor of st eady state creep rate, of inverse relaxation time of primary stage and of recovery rate are linear functions of respective stress exponents. These functions are discussed within the framework of Dorn's equation . Their existence makes a formulation of a general constitutive equati on possible which describes the creep rate in the presented class of a lloys as a function of only one material variable, namely the stress e xponent of steady state creep rate.