Through Thickness Microstructural Gradients in 7475 and 2022 Creep - Ageformed Bend Coupons

D. Bakavos; Phil B. Prangnell; Bernard Bès; Frank Eberl; Simon Gardiner

doi:10.4028/www.scientific.net/MSF.519-521.407

Paper Titles

Age Hardening of Forged Aluminium Components – Mechanical Properties and Distortion Behaviour after Gas Quenching
p.383

Thermal Stability of Rapidly Solidified Alloys of Aluminium with Transition Metals
p.389

Microstructure and Phase Composition of Al-Ce-Cu Alloys in the Al-Rich Corner
p.395

The Effect of Heat Treatment and Mn, Cu and Cr Additions on the Structure of Ingots of Al-Mg-Si-Fe Alloys
p.401

Through Thickness Microstructural Gradients in 7475 and 2022 Creep - Ageformed Bend Coupons
p.407

Effect of Al₃Ni and Mg₂Si Eutectic Phases on Casting Properties and Hardening of an Al-7% Zn-3% Mg Alloy
p.413

Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature
p.419

Effects of a Small Addition of Cu or Ge on the Microstructure and Mechanical Property of an Al-Si Alloy
p.425

Quantitative Correlation between Strength, Ductility and Precipitate Microstructures with PFZ in Al-Zn-Mg(-Ag, Cu) Alloys
p.431

HomeMaterials Science ForumMaterials Science Forum Vols. 519-521Through Thickness Microstructural Gradients in...

Through Thickness Microstructural Gradients in 7475 and 2022 Creep - Ageformed Bend Coupons

Abstract:

In creep-ageforming a material experiences continuously variable bending stresses through its thickness, from tensile to compressive, which are maximum at the surfaces. This can potentially result in through thickness microstructural gradients, due to interactions between the bending stresses, creep, and precipitation occurring during ageing, that can alter a component’s performance. The aim of the work reported here was to develop an understanding of these effects in an industrial creep ageforming process. For this purpose two aerospace alloys, 7475 and 2022, were ageformed by Airbus UK using industrial scale ageforming tools. Their microstructures were analysed in detail by TEM, and SAXS, which revealed significant through thickness microstructural changes after forming.

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

407-412

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.407

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Cite this paper

Online since:

July 2006

Authors:

D. Bakavos, Phil B. Prangnell, Bernard Bès, Frank Eberl, Simon Gardiner

Keywords:

AA2022, AA7475, Age-Forming, Bend Coupons, Creep Forming, Microstructural Gradients, Precipitate Stress Interactions, SAXS, Small Angle X-Ray Scattering, Stress Ageing, TEM

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References

[1] M.C. Holman: J. of Mechanical Working Technology, Vol. 20, (1989), p.477.

Google Scholar

[2] M. W.F. Hosford, and S.P. Agrawal: Metall. Trans. A, Vol. 6A, (1975), p.87.

Google Scholar

[3] T. Eto, A. Sato and T. Mori: Acta. Met. Vol. 26, (1978), p.499.

Google Scholar

[4] H. Hargarter, M.T. Lyttle, E.A. Starke: Mater. Sci. and Eng., Vol. A257 (1998), p.87.

Google Scholar

[5] B. Skrotzki, G.J. Shiflet, E.A. Starke Jr: Met. and Mat. Tra. A, Vol. 27A, (1996), p.3431.

Google Scholar

[6] A.W. Zhu, E. A Starke Jr: Act. Mat., Vol 49, (2001), p.2285.

Google Scholar

[7] D. Bakavos, P.B. Prangnell, R. Dif: Mater. Sci. Forum, Vol . 28, (2004), p.124.

Google Scholar

[8] D. Bakavos, P.B. Prangnell, B. Bes. Eberl, J. G Grossman; in the present proceedings.

Google Scholar

[9] R. N. Lumley, A. J. Morton and I. J. Polmear: Acta Mater., Vol. 50, (2002), p.3597.

Google Scholar

[10] R.F. Robey, P.B. Prangnell, R. Dif: Mater. Sci. Forum, Vol . 28, (2004), p.132.

Google Scholar

[11] A. Deschamps: Analytical Techniques for aluminium alloys, Handbook of Aluminium, Vol. 2, p.155 (Marcel Dekker, Inc., New York, USA, 2003, ed.G.E. Totten and D.S. MacKenzie).

Google Scholar

[12] .M.R. Baig, S. Gupta, S. Messoloras and R.J. Stewart: J. Appl. Cryst. Vol. 24, (1991), p.349.

Google Scholar

[13] A. Deschamps, F. Livet and Y. Brechet: Acta. Mater., Vol. 47, (1999), p.281.

Google Scholar

[14] H.J. Axon and W. Hume-Rothery: Proc. Roy. Soc, Vol. A193, (1948), p.1.

Google Scholar