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Fatigue and fracture-induced defect structures of metals investigated by positron microscopy

  • W. Egger , G. Kögel , P. Sperr , W. Triftshäuser , J. Bär , S. Rödling and H.-J. Gudladt EMAIL logo
Published/Copyright: February 16, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 94 Issue 6

Abstract

Defect distributions close to cracks from monotonic and fatigue fractures have been investigated for the first time by positron lifetime studies. The positron beams probe either the depth profile of defects at sub-μm resolution or the lateral distribution of defects at a few μm spatial resolution. Both in pure Cu and in the precipitation-hardened alloy Al 6013, in addition to dislocations, large clusters of up to 30 vacancies were detected close to a fatigue crack exclusively, whereas at monotonic fractures only the annihilation characteristics of dislocations were observed. If this characteristic difference holds as a general rule, then positron lifetime microscopy will provide a simple, quantitative method to distinguish a posteriori monotonic fractures from fatigue fractures without any further fractographic studies.

Keywords: Positron annihilation; Positron microscopy; Vacancy clusters; Fatigue; Fracture
Prof. Dr. H-J. Gudladt Institut für Werkstoffkunde D-85577 Neubiberg, Germany Tel.: +49 89 6004 2534 Fax: +49 89 6004 3295

Dedicated to Professor Dr. Otmar Vöhringer on the occasion of his 65th birthday

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Received: 2002-10-21
Published Online: 2022-02-16

© 2003 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Bedeutung von Eigenspannungsabbau und mikrostrukturellen Veränderungen für die Lebensdauervorhersage schwingbeanspruchter Schweißverbindungen
  4. Factors affecting cyclic lifetime of EB-PVD thermal barrier coatings with various bond coats
  5. Depth-resolved X-ray residual stress analysis in PVD (Ti, Cr) N hard coatings
  6. Crystal orientation and residual stress in TiN film by synchrotron radiation
  7. Characterization of thermal and anodic oxide layers on β- and on near-β-titanium alloys for biomedical application
  8. Micromechanisms and modelling of crack initiation and growth in tool steels: role of primary carbides
  9. Fatigue crack nucleation at grain boundaries – experiment and simulation
  10. Fatigue and fracture-induced defect structures of metals investigated by positron microscopy
  11. Deformation and fracture of Nb/α-Al2O3 composites in compression and bending studied by optical methods
  12. Dislocation microstructures of single crystal ⟨001⟩ CMSX-4 specimens tensile tested at 700 and 1000°C
  13. Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI
  14. Precipitation of β-phase and twinning during deformation of Mg–Al alloy AZ91 at 150 °C after solution treatment
  15. Nanograin size, high-nitrogen austenitic stainless steels
  16. Der dynamische SD-Effekt und der Einfluss auf die Fließortkurve
  17. Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten metallischer Werkstoffe
  18. Mean stress sensitivity of sintered iron and steel
  19. Thermozyklisches Kriechen einer kurzfaserverstärkten Aluminium-Kolbenlegierung
  20. Strength and ductility of thin Cu wires
  21. Modeling of deformation behavior of copper under equal channel angular pressing
  22. Reaktionssintern von AlMg–MgO zur Herstellung von Bauteilen auf Spinellbasis
  23. Determination of the local oxygen distribution in a commercial titanium alloy by 3-dimensional atom probe
  24. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  25. Notifications/Mitteilungen
  26. Personal/Personelles
  27. Books/Bücher
  28. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2003-0119
Keywords for this article
Positron annihilation; Positron microscopy; Vacancy clusters; Fatigue; Fracture

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Bedeutung von Eigenspannungsabbau und mikrostrukturellen Veränderungen für die Lebensdauervorhersage schwingbeanspruchter Schweißverbindungen
  4. Factors affecting cyclic lifetime of EB-PVD thermal barrier coatings with various bond coats
  5. Depth-resolved X-ray residual stress analysis in PVD (Ti, Cr) N hard coatings
  6. Crystal orientation and residual stress in TiN film by synchrotron radiation
  7. Characterization of thermal and anodic oxide layers on β- and on near-β-titanium alloys for biomedical application
  8. Micromechanisms and modelling of crack initiation and growth in tool steels: role of primary carbides
  9. Fatigue crack nucleation at grain boundaries – experiment and simulation
  10. Fatigue and fracture-induced defect structures of metals investigated by positron microscopy
  11. Deformation and fracture of Nb/α-Al2O3 composites in compression and bending studied by optical methods
  12. Dislocation microstructures of single crystal ⟨001⟩ CMSX-4 specimens tensile tested at 700 and 1000°C
  13. Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI
  14. Precipitation of β-phase and twinning during deformation of Mg–Al alloy AZ91 at 150 °C after solution treatment
  15. Nanograin size, high-nitrogen austenitic stainless steels
  16. Der dynamische SD-Effekt und der Einfluss auf die Fließortkurve
  17. Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten metallischer Werkstoffe
  18. Mean stress sensitivity of sintered iron and steel
  19. Thermozyklisches Kriechen einer kurzfaserverstärkten Aluminium-Kolbenlegierung
  20. Strength and ductility of thin Cu wires
  21. Modeling of deformation behavior of copper under equal channel angular pressing
  22. Reaktionssintern von AlMg–MgO zur Herstellung von Bauteilen auf Spinellbasis
  23. Determination of the local oxygen distribution in a commercial titanium alloy by 3-dimensional atom probe
  24. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  25. Notifications/Mitteilungen
  26. Personal/Personelles
  27. Books/Bücher
  28. Conferences/Konferenzen
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