The advantages of low‐heat joining, such as low distortion and no appreciable influence on the local material properties as a result of the low heat input, should be utilized for improving the reliability of processes for the manufacture of high‐strength structures. For this purpose, the mutual interactions among the parameters of the joining process, the brazing‐seam geometry, the brazing filler, the type of stress, and the fatigue strength, especially for arc‐brazed structures, are the subject of investigations for estimating the lifetime of locally hardened components by computational methods in the future. Fatigue life tests of brazed specimens show a significant increase of fatigue life compared to laser‐welded specimens. A further increase of fatigue life is expected by optimizing the geometry of the seam.
The fatigue corrosion cracking of the Al7075 alloy has been investigated by Scanning Electron Microscopy (SEM) and Auger Electron Spectroscopy (AES). Specimen exposed to cyclic load at room temperature until crack initiation show a significant increase of magnesium within a distance of about 1 lm around the crack, while almost no aluminum was left. This segregation effect has been investigated in detail, yielding that the diffusion should most likely be driven by the gradient of the chemical potential through the oxidation of magnesium at the surface, while the required mobility for the diffusion process was gained by the mechanical stress of the cyclic loading. Die Schwingungsrisskorrosion der Aluminiumlegierung 7075 wurde mit Rasterelektronemikroskopie und Augerelektronenspektroskopie untersucht. Proben, die bei Raumtemperatur bis zur Rissbildung einer zyklischen Last ausgesetzt waren, zeigen eine signifikante Erhöhung des Magnesiumgehalts in der Umgebung um den Riss, während fast kein Aluminium übrig bleibt. Dieser Segregationseffekt wurde im Detail untersucht. Dabei ergibt sich, daß die Diffusion höchstwahrscheinlich vom Gradienten des chemischen Potenzials durch die Oxidation von Magnesium an der Oberfläche getrieben wird. Die nötige Mobilität für den Diffusionsprozess liefert die mechanische Spannung durch die zyklische Last. Schlüsselwörter: Schwingungsrisskorrosion / Rissbildung / Augerelektronenspektroskopie / Aluminium /
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