High temperature deformation of a commercial aluminum alloy |
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| Authors: | P Olla and P F Virdis |
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| Affiliation: | (1) Institute of Applied Chemistry and Metallurgy, University of Cagliari, Cagliari, Italy |
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| Abstract: | A study of high temperature deformation of a commercial aluminum alloy has been undertaken through tensile tests at strain
rates ranging from 5.6 × 10-5 s-1 to 5.6 × 10-2 s-1 and load relaxation testing in the temperature range 473 to 873 K. Experiments have established that maximum ductility is
reached at about 623 K and at maximum strain rates. Maximum fracture ductility corresponds to minimum uniform elongation.
The deformation and fracture mechanisms operating in the temperature range 473 to 573 K seem to differ from those between
623 K and 823 K; different strain rate sensitivities are also observed. Dynamic recovery is the dominant softening mechanism
in high temperature plastic deformation—that is, a thermally activated process whose kinetics can be suitably described by
an empirical power relation. |
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