Fatigue Crack Propagation in New Generation Aluminium Alloys

Abstract:

The fatigue crack propagation behaviour of a new third generation Al-Cu-Li alloy type 2050-T84 developed for aeronautical applications is studied in comparison to a new generation Al-Cu-Mg alloy type 2022-T851. The alloy resistance against crack growth is shown to depend on alloy composition, aging condition and atmosphere environment. The crack path and the growth rate at moderate DK and in the near-threshold domain are discussed in terms of the slip morphology with respect to the microstructure. The different crack propagation regimes, as identified by mean of micro-fractographic observations and EBSD analysis are discussed on the basis of a modelling framework elaborated for conventional metallic alloys.

• Periodical: Key Engineering Materials (Volumes 488-489)
• Pages: 476-479
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.488-489.476
• Online since: September 2011
• Authors: Sébastien Richard, Christine Sarrazin-Baudoux, Jean Petit
• Keywords: Al-Cu-Li and Al-Cu-Mg Alloys, Atmosphere Environment, Crack Closure, Fatigue Crack Propagation, Microstructure, Modeling, Slip Mechanisms

References

[1] S. Richard, C. Gasquères, C. Sarrazin-Baudoux, and J. Petit Engng. Fract. Mech. (in press).

[2] J. Petit, G. Hénaff and C. Sarrazin-Baudoux, in: ASTM STP 1372, (2000), p.3.

[3] C. Gasquères, C. Sarrazin-Baudoux, J. Petit and D. Dumont, Script. Mater. Vol. 53 (2005), p.1333.

[4] J. Petit, G. Hénaff and C. Sarrazin-Baudoux, in: Comprehensive Structural Integrity: Environmentally-assisted Fracture, J. Petit and P. Scott eds., Vol. 6 (2003), p.211.

DOI: 10.1016/b0-08-043749-4/06130-9

[5] K.J. Miller and E. R. De Los Rios: The Behaviour of Short Fatigue Cracks, (Mechanical Engineering Publications Limited, London 1986).

[6] S.P. Lynch, ASTM STP 675, (1978), p.174.

[7] Y. Ro, S.R. Agnew, G.H. Bray and R.P. Gangloff, Mat. Sci. and Engng. A (2007), p.88.