Effect of superimposed oscillations on the creep characteristics of Al-22 wt% Ag alloy
Mahmoud, Moustafa;
Abstract
The behavior of both transient and steady state creep of Al-22 wt% Ag alloy was investigated using a constant stress in the aging temperatures range 423 to 683 K where torsional oscillations of different frequencies and amplitudes were operated at various
testing temperatures. The subsequent decrease and increase in the creep parameters, n, β and εst with increasing aging temperatures has been explained on the basis of structure transformations occurring in Al-Ag system and their mode of interaction with mobile dislocations created by the applied stress and the imposed oscillations. An augment in
both transient and steady state rates was observed by increasing both frequency and amplitude of the applied oscillations. Dislocation intersection mechanism is assumed as the rate controlling mechanism for both creep stages
testing temperatures. The subsequent decrease and increase in the creep parameters, n, β and εst with increasing aging temperatures has been explained on the basis of structure transformations occurring in Al-Ag system and their mode of interaction with mobile dislocations created by the applied stress and the imposed oscillations. An augment in
both transient and steady state rates was observed by increasing both frequency and amplitude of the applied oscillations. Dislocation intersection mechanism is assumed as the rate controlling mechanism for both creep stages
Other data
| Title | Effect of superimposed oscillations on the creep characteristics of Al-22 wt% Ag alloy | Authors | Mahmoud, Moustafa | Keywords | creep superimposed oscillations | Issue Date | 2002 | Publisher | Kluwer Academic Publishers | Journal | Journal of Materials Science | Volume | 37 | Start page | 2215 | End page | 2223 |
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