Linking Crack Tip Morphology to Tear Toughness of Hot Rolled AA7050 Alloys Using X-Ray Computed Tomography

Authors

  • Xiaomin Wu,

    Corresponding author
    1. Faculty of Aerospace Engineering, Material Innovation Institute (M2i), Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
    • Faculty of Aerospace Engineering, Material innovation institute (M2i), Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands.
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  • Erik Schlangen,

    1. Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands
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  • Sybrand van der Zwaag

    1. Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
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  • This research was carried out under the project numbers M41.10.08322 in the framework of the Research Program of the Materials Innovation Institute (www.m2i.nl). Support and technical discussions with Arjan Thijssen, Wim Verwaal, and Jos van Meel (Faculty of Civil Engineering and Geosciences, Delft University of Technology) are appreciated.

Abstract

A lab scale X-ray tomography scanner is used to quantify the morphological details of crack tip regions of Kahn tear tested AA7050 aluminum samples subjected to different hot rolling conditions. The 3D crack tip images show distinctive differences in crack tip morphology (such as orientation and shape of the crack tip, bridging ligaments, crack opening distance, and plastic deformation around the crack tip) for samples with different fracture toughness. Quantification of the observations showed that the fracture toughness of AA7050 sample is directly related to the crack tip opening angle measured with computer tomography method.

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