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5 Werkstofftechnik

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Autor

  • Rockenhäuser, Christian (14) (entfernen)

Erscheinungsjahr

  • 2018 (14) (entfernen)

Dokumenttyp

  • Zeitschriftenartikel (4)
  • Vortrag (4)
  • Beitrag zu einem Tagungsband (3)
  • Posterpräsentation (2)
  • Forschungsbericht (1)

Sprache

  • Englisch (11)
  • Deutsch (3)

Referierte Publikation

  • nein (12)
  • ja (2)

Schlagworte

  • Degradation (8)
  • Coarsening (7)
  • Alloy 2618A (6)
  • Aluminium (6)
  • S-phase (6)
  • Dark-field transmission electron microscopy (DFTEM) (4)
  • Dark-field transmission electron microscopy (3)
  • Aging (2)
  • Aluminum (2)
  • Creep (2)
+ weitere

Organisationseinheit der BAM

  • 5 Werkstofftechnik (14)
  • 5.2 Experimentelle und modellbasierte Werkstoffmechanik (13)
  • 5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe (1)

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Influence of heat treatment and creep loading on an Al-Cu-Li alloy (2018)
Rockenhäuser, Christian
The influence of heat treatment and creep loading on the microstructure of an Al-Cu-Li alloy was investigated. Especially the formation of different precipitates (T1 and Theta') were characterized and the microstructural changes under different ageing conditions (with and without external strain) were investigated to determine the effect od stress on the ageing process.
Identification and 3D reconstruction of Cr5S6 precipitates along grain boundaries in Fe13Cr (2018)
Nützmann, Kathrin ; Wollschläger, Nicole ; Rockenhäuser, Christian ; Kranzmann, Axel ; Stephan-Scherb, Christiane
Metal sulfide grain boundary precipitates of a ferrous model alloy with 13 wt.% chromium formed at 650°C under a gas atmosphere containing 0.5% SO2 and 99.5% Ar were investigated after ageing for 3 h, 6 h, and 12 h. The precipitates formed along grain boundaries were identified as Cr5S6 using energy-dispersive x-ray spectroscopy in transmission electron microscopy and electron backscatter diffraction analysis. Serial focused ion beam slicing was conducted followed by three-dimensional reconstruction to determine the number, size, and penetration depth of the precipitates evolved at the different time steps. There was a linear increase in the number of precipitates with time, while their average size increased only for the initial aging time but became constant after 6 h. Based on these results, a model for grain boundary sulfidation of ferritic alloys is discussed.
Long term ageing of alloy 2618A (2018)
Rockenhäuser, Christian
Results of the in vestigation of the "Long term ageing of alloy 2618A" were presented.
Comparison of long-term radii evolution of the S-phase in aluminum alloy 2618A during ageing and creep (2018)
Rockenhäuser, Christian ; Schriever, Sina ; von Hartrott, P. ; Piesker, Benjamin ; Skrotzki, Birgit
A study was made on the effect of creep loading on the precipitate radii evolution of the aluminum alloy 2618A. The overageing process of the alloy was investigated under load at a temperature of 190 °C with stresses between 79 and 181 MPa and compared to stress free isothermal ageing. The precipitates responsible for strength were characterized using dark-field transmission electron microscopy (DFTEM). This allows the experimental Determination of radii distributions of the rod-shaped Al2CuMg precipitates and the evaluation regarding their mean precipitate radius. It was found that the mean precipitate radius enables the comparison of the different microstructural conditions of crept and uncrept samples. The mean precipitate radii of the samples experiencing creep are significantly higher than those of undeformed samples. It was shown that the acquired radii distributions are viable to determine averaged particle radii for comparison of the aged samples. A ripening process including pipe diffusion along dislocations describes the data on coarsening very well for the creep samples.
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