Ingenieurwissenschaften und zugeordnete Tätigkeiten
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- 2023 (2) (entfernen)
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- Englisch (2)
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- Al-3.85%Mg alloy (1)
- Aluminium alloys (1)
- Creep (1)
- Denoising filter (1)
- Diffraction peak width (1)
- Dislocations (1)
- Electron backscatter diffraction (EBSD) (1)
- Fractals (1)
- Power-law breakdown (1)
- Steady-state creep (1)
Organisationseinheit der BAM
The peak broadening in neutron diffraction experiments on tensile specimens of pure Al (99.8%) and an Al-Mg alloy pre-deformed at different creep strains is analysed. These results are combined with the kernel angular misorientation of electron backscatter diffraction data from the creep-deformed microstructures. It is found that differently oriented grains possess different microstrains. These microstrains vary with creep strain in pure Al, but not in the Al-Mg alloy. It is proposed that this behaviour can explain the power-law breakdown in pure Al and the large creep strain observed in Al-Mg. The present findings further corroborate a description of the creep-induced dislocation structure as a fractal, predicated on previous work.
The electron backscatter diffraction (EBSD) technique is used to investigate the dislocation structures formed after steady-state creep deformation of an Al-3.85%Mg alloy. This material is crept at two different stress levels, corresponding to the so-called power-law and power-law breakdown regimes. The results show that, regardless of the creep stress level, the strain tends to localize, leading to the formation of intragranular bands. The thickness of such bands is larger when the material is tested at loads corresponding to the power-law breakdown. This suggests enhanced diffusion by dislocation pipes.