Study on the effects of microstructures on the fracture behavior of an Al-Cu-Mg alloy

In this study, a special fracture delamination in L-T fracture toughness specimens of an Al-Cu-Mg alloy was researched by applying three-dimensional optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) methods. The results indicate that the fractur...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-08, Vol.2566 (1), p.12090
Main Authors: Liu, Qilong, Li, Xiwu, Li, Zhihui, Wang, Fengchun, Fu, Jinlai, Gao, Guanjun
Format: Article
Language:English
Subjects:
Aluminum base alloys
Copper
Delamination
Electron back scatter
Fracture toughness
Grain size
Magnesium
Optical microscopy
Physics
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Summary:In this study, a special fracture delamination in L-T fracture toughness specimens of an Al-Cu-Mg alloy was researched by applying three-dimensional optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) methods. The results indicate that the fracture delamination is contributed by the cracks extending a long distance in the T-direction and extending internally along the L-direction, which can result in a lower fracture toughness value. The fracture delamination is determined by the level of grain flattening and the distribution of the second phases. The flat grains result in a tendency for cracks to extend in the T-direction. At the same time, the unevenly distributed Al 2 Cu and Al 2 CuMg phases lead to cracks extending in the L-direction, which eventually causes the formation of delamination fractures. The reduction in grain size can also contribute to weakening the fracture delamination to a certain extent.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2566/1/012090