Abstract
Scanning electron microscopy, transmission electron microscopy, tensile test, exfoliation corrosion test, and slow strain rate tensile test were applied to investigate the properties and microstructure of Al-Zn-Mg-Cu alloy processed by final thermomechanical treatment, retrogression reaging, and novel thermomechanical treatment (a combination of retrogression reaging with cold or warm rolling). The results indicate that in comparison with conventional heat treatment, the novel thermomechanical treatment reduces the stress corrosion susceptibility. A good combination of mechanical properties, stress corrosion resistance, and exfoliation corrosion resistance can be obtained by combining retrogression reaging with warm rolling. The mechanism of the novel thermomechanical treatment is the synergistic effect of composite microstructure such as grain morphology, dislocation substructures, as well as the morphology and distribution of primary phases and precipitations.
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This work is financially supported by Australia-China Special Fund (Grant No. 51011120052) and the National Natural Science Foundation of China (Grant No. 50871123).
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Chen, Z., Ren, J., Zhang, J. et al. Regulation Mechanism of Novel Thermomechanical Treatment on Microstructure and Properties in Al-Zn-Mg-Cu Alloy. J. of Materi Eng and Perform 25, 359–364 (2016). https://doi.org/10.1007/s11665-015-1856-8
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DOI: https://doi.org/10.1007/s11665-015-1856-8