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Effect of isochronal aging on the steady creep of Al-2 wt.% Ag and Al-5 wt.% Ag

✍ Scribed by M.R. Nagy; M.I. El-Agrab; M.H. Mahmood; A.A. Mohamed

Publisher
Elsevier Science
Year
1986
Weight
353 KB
Volume
142
Category
Article
ISSN
0378-4363

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✦ Synopsis

The effect of isochronal aging of quenched Al-2 wt. % Ag and Al-5 wt. % Ag on the steady state creep was determined in the temperature range (393-623 K), by measuring the steady strain rate (E,,) for a period of 120 s at a series of temperature values, 20 K apart. For the two alloys, two and three successive steady strain rate stages were found in the precipitation of quenched (supersaturated) samples depending upon the aging temperature. The first stage involves the formation and subsequent dissolution of G.P. zones. The second stage involves the formation and subsequent dissolution of metastable ['-phase. The third stage involves the growing of stable .&phase. Micro-structural analysis confirmed the formation of spherical G.P. zones during isochronal aging of the quenched samples from 393 K to 413 K.

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