The variation of work hardening characteristics of Al-5 wt% Mg alloy during phase transition

The aim of this study is to investigate the effect of aging conditions on the stress−strain behavior along with microstructure changes of the Al-5 wt% Mg alloy. Following solid solution treatment and aging of specimens at temperatures ranging from 373 to 573 K for various aging times (1/4 to 4 h), s...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 2010-09, Vol.405 (17), p.3616-3623
Hauptverfasser: Mahmoud, M.A., Sobhy, M., Abd El-Rehim, A.F., Abdel Rahman, R.M.
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Sprache:eng
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Zusammenfassung:The aim of this study is to investigate the effect of aging conditions on the stress−strain behavior along with microstructure changes of the Al-5 wt% Mg alloy. Following solid solution treatment and aging of specimens at temperatures ranging from 373 to 573 K for various aging times (1/4 to 4 h), stress−strain tests were performed at different testing temperatures (313−343 K). The work hardening parameters ( σ y, σ f, χ p and Y) were found to decrease continuously with pre-aging times at all aging and testing temperatures, where the softening parameters ( ε f and L) oppose this behavior. The variation in stress−strain parameters with increasing aging temperatures and aging times was explained on the basis of structural transformations taking place in the Al−Mg alloy. A precipitate-dislocation intersections mechanism was assumed as the rate-controlling mechanism for alloy.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2010.05.051