Abstract
A great deal of work has been made on the high-temperature creep of dispersion-strengthening alloys, and some precipitation strengthening alloys show that the activation energy of creep is very large as compared with the activation energy of self-diffusion in the matrix metal. In order to understand the mechanism controlling the high temperature creep of dispersion-strengthening alloys and usual precipitation-strengthening alloys, the high temperature internal friction and creep of internally oxidized copper-aluminum alloys were investigated. The results obtained are as follows : The dislocations joining hard particles remain very stable even after high-temperature annealing. The activation energies of steady state creep and of the relaxation process of the damping peak at about 750°C were 84 kcal/mol and 70 kcal/mol, respectively. It has been predicted that these activation processes are both in a non-conservative motion of pin-downed dislocation bound directly on the hard particle surface.
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