Making Al-Cu-Mg alloy tough by Goss-oriented grain refinement

•When the grain size is refined to less than 40 µm, the strength-ductility trade-off can be improved.•The FCP rate can be reduced by refining Goss-oriented grain.•The grain size can be refined by increasing annealing temperature. [Display omitted] The microstructure evolution and its effect on the s...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-05, Vol.904, p.164095, Article 164095
Main Authors: Liu, Fei, Liu, Zhiyi, He, Guangyu
Format: Article
Language:English
Subjects:
Aluminum alloy
Aluminum base alloys
Copper
Crack propagation
Ductility
Electron microscopes
Fatigue crack propagation
Fatigue failure
Goss texture
Grain refinement
Magnesium
Optical microscopes
Strength-ductility trade-off
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Summary:•When the grain size is refined to less than 40 µm, the strength-ductility trade-off can be improved.•The FCP rate can be reduced by refining Goss-oriented grain.•The grain size can be refined by increasing annealing temperature. [Display omitted] The microstructure evolution and its effect on the strength properties and fatigue performance of the Al-Cu-Mg alloy are investigated by using optical microscope (OM), scanning electron microscope (SEM), electron back-scattered diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). Results show that the strength-ductility trade-off can be improved and the fatigue crack propagation (FCP) rate of the Al-Cu-Mg alloy can be reduced by refining Goss-oriented grains. Post-fatigue electron back-scatter diffraction revealed that the strain homogenization can make the interior of fine Goss-oriented grain to occur the tiny deformation, which is not easy to transmit damage to adjacent grains. Therefore, refining Goss-oriented grains not only increases the strength but also improves the ductility and promotes crack deflection, reducing the FCP rate.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.164095