Anisotropy of Bending Properties in Industrial Heat-Treatable Extruded Aluminium Alloys

Abstract:

In the present work, three-point bending tests have been performed on four commercially extruded 6xxx- and 7xxx alloys, one with a fibrous and one with a recrystallized grain-structure for each alloy class, with the bending axis orientated 0, 45 and 90° with respect to the extrusion direction. Microstructure and texture characterization as well as tensile testing of the same materials have been performed and correlated with the bending results. In general there is good agreement between the bending angle and the fracture strain for all alloys, with the highest values in the extrusion direction. However, there are no indications in the microstructure and texture that explain the large differences in bendability observed. Die lines and recrystallized layer on a fibrous alloy have been removed to investigate their effect on the bending behaviour. However, these effects also seem to be limited, and cannot explain the anisotropy effects observed in bending angles.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 487-492
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.487
• Online since: January 2010
• Authors: Knuter E. Snilsberg, Ida Westermann, Bjørn Holmedal, Odd Sture Hopperstad, Y. Langsrud, Knut Marthinsen
• Keywords: Aluminum (Al), Anisotropy, Tensile Testing, Texture, Three Point Bending Test

References

[1] H. Bold, Plattchen-Biegeversuch, In PAPP PWT, Daimler Chrysler (2008).

[2] K.O. Pedersen, H.J. Roven, O.G. Lademo, and O.S. Hopperstad, Materials Science and Engineering A, 463 (2008) p.81.

[3] T.F. Morgenmeyer, M.J. Starink, S. C Wang, I. Sinclair, Acta Materialia 56 (2008) p.2872.

[4] K. Marthinsen, O. Daaland, T. Furu and E. Nes, Metallurgical and Materials Transactions 34A, (2003) p.2705.

[5] J. Sarkar , T.R.G. Kutty, D.S. Wilkinson J.D. Embury, D.J. Lloyd, Materials Science and Engineering A369 (2004) p.258.