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Investigation of fatigue cracks in aluminium alloys 2024 and 6013 in laboratory air and corrosive environment

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Abstract

Fatigue cracks have been generated in the commercial aluminium alloys AA2024 and AA6013 and analysed with a positron microprobe. This instrument provides laterally resolved positron annihilation measurements, which are sensitive to lattice defects like vacancies and dislocations. These commercial alloys have undergone a solution heat treatment and quenching prior to fatigue testing. Subsequently, they have been aged at room temperature and 190°C for AA2024 and AA6013, respectively. We performed the fatigue crack generation both in air and under the influence of a chemically aggressive environment (artificial seawater). Due to the corrosive environment hydrogen is probably produced at the fresh fractured surface in the vicinity of the crack tip. We discuss the possible implications of in-diffused hydrogen on the produced lattice defects, especially when there is a delayed migration of vacancies in the lattice, due to a reduced mobility.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany

    Ch. Zamponi, St. Sonneberger, M. Haaks, I. Müller, T. Staab & K. Maier

  2. Airbus Deutschland, Hünefeldstrasse 1-5, D-28199, Bremen, Germany

    G. Tempus

Authors
  1. Ch. Zamponi
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  2. St. Sonneberger
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  3. M. Haaks
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  4. I. Müller
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  5. T. Staab
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  6. G. Tempus
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  7. K. Maier
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Zamponi, C., Sonneberger, S., Haaks, M. et al. Investigation of fatigue cracks in aluminium alloys 2024 and 6013 in laboratory air and corrosive environment. Journal of Materials Science 39, 6951–6956 (2004). https://doi.org/10.1023/B:JMSC.0000047537.16498.1d

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  • DOI: https://doi.org/10.1023/B:JMSC.0000047537.16498.1d

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