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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

Published online by Cambridge University Press:  24 January 2012

Xiaomin Wu ,
Erik Schlangen  and
Sybrand van der Zwaag
Xiaomin Wu
Affiliation:
Material innovation institute M2i, Mekelweg 2, 2628 CD, Delft, The Netherlands Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
Erik Schlangen
Affiliation:
Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628 CN, Delft, The Netherlands
Sybrand van der Zwaag
Affiliation:
Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
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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.

Keywords

Alporosityx-ray tomography
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1421: Symposium PP – Three-Dimensional Tomography of Materials , 2012 , mrsf11-1421-pp06-09
Copyright
Copyright © Materials Research Society 2012

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References

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