Effects of a short-duration preprecipitation process prior to predeformation aging on the mechanical properties and corrosion resistance of Al-Cu-Mg-Ag alloy
ISSN: 1708-5284
Article publication date: 21 March 2022
Issue publication date: 10 May 2022
Abstract
Purpose
The effects of the thermo-mechanical treatment on the properties and microstructure of the Al–Cu–Mg–Ag alloy were investigated.
Design/methodology/approach
A short-duration preprecipitation process is designed prior to predeformation aging. The novel predeformation aging (solution treatment + holding at 185 °C for 15 min+ rolling deformation + aging at 185 °C, also named T8) was performed on a heat-resistant Al–Cu–Mg–Ag alloy.
Findings
The purpose of this study indicate that a short-duration heat treatment before predeformation is beneficial to the precipitation of O during the aging process. The precursors of O during this process might pin the dislocation and cause the grains to orient along some specific direction, which might be advantageous to the precipitation of O while disadvantageous to that of θ′. This novel thermal-mechanical process could result in an increase in the quantity and decrease in the size of the precipitation of O, which leads to a remarkable strength effect. The potential increases while the current density decreases with an increase in the deformation amount, which implies a smaller intergranular corrosion rate. The fine deformed structure leads to an opposite behavior in the exfoliation corrosion test compared with that for intergranular corrosion.
Originality/value
The intergranular corrosion resistance of the Al–Cu–Mg–Ag alloy is enhanced, whereas the exfoliation corrosion resistance is reduced by novel predeformation aging.
Keywords
Acknowledgements
Authors thank the Science and Technology Research Project of Hebei Province (ZD2018213), Science and Technology Research and Development Projects of Handan City (19422111008–20) and the National Natural Science Foundation (51601053) for the financial support of investigations.
Citation
Wang, Y., Wang, L., Liu, X.Y., Yang, H., Zhang, Y. and Zhu, X. (2022), "Effects of a short-duration preprecipitation process prior to predeformation aging on the mechanical properties and corrosion resistance of Al-Cu-Mg-Ag alloy", World Journal of Engineering, Vol. 19 No. 3, pp. 429-435. https://doi.org/10.1108/WJE-01-2021-0014
Publisher
:Emerald Publishing Limited
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