Fatigue Behaviour in Fine Grained Aluminium Alloys
The effects of alloy production method on microstructure and hence fatigue crack growth rate and fracture mechanism have been examined for a variety of fine-grained/high dispersoid Al-Li-Mg-Zr and Al-Li-Cu-Mg-Zr alloys. Microstructures have been assessed by scanning and transmission electron microcopy, together with electron back scattered diffraction pattern assessment. In these fine-grained/high dispersoid materials, high crack growth rates are seen in comparison to the traditional DC cast alloys, excepting a material with high volume fraction of shearable precipitate. The effects of fracture surface roughness and closure levels in determining crack growth rates has been assessed.
W.J. Poole, M.A. Wells and D.J. Lloyd
L.J. Venning et al., "Fatigue Behaviour in Fine Grained Aluminium Alloys", Materials Science Forum, Vols. 519-521, pp. 1077-1082, 2006