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Relating the fatigue lifetime of hot rolled AA7xxx alloys to the pore size distribution as determined by 3D X-ray tomography

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Abstract

A set of hot rolled 7xxx aluminum alloys with modification of processing conditions were analyzed on their fatigue life time as well as the internal microstructure using 3D computed X-ray tomography with a lab scale scanner and optical microscopy. It is shown that for conventional hot rolling conditions many large (>300μm) casting pores were retained in the material. With modifications of the rolling conditions the size and density distribution of the retained casting pores were significantly reduced, leading to greatly improved fatigue life times.

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Acknowledgments

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 (Civil Engineering, TUDelft) are appreciated.

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Authors and Affiliations

  1. Material innovation institute M2i, Mekelweg 2, 2628 CD, Delft, The Netherlands

    Xiaomin Wu

  2. Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands

    Xiaomin Wu & Sybrand van der Zwaag

  3. Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628 CN, Delft, The Netherlands

    Erik Schlangen

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  1. Xiaomin Wu
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  2. Erik Schlangen
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  3. Sybrand van der Zwaag
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Wu, X., Schlangen, E. & van der Zwaag, S. Relating the fatigue lifetime of hot rolled AA7xxx alloys to the pore size distribution as determined by 3D X-ray tomography. MRS Online Proceedings Library 1421, 12–17 (2012). https://doi.org/10.1557/opl.2012.150

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  • DOI: https://doi.org/10.1557/opl.2012.150

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