Venning, L.J., Sinclair, I. and Reed, P.A.S.,
Fatigue behaviour in fine grained aluminium alloys
Poole, W.J., Wells, M.A. and Lloyd, D.J. (eds.)
At 10th International Conference on Aluminum Alloys.
09 - 13 Jul 2006.
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.
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