The Effect of Elastic Straining on a 6060 Aluminium Alloy during Natural or Artificial Ageing

Abstract:

The effect on hardness and precipitate microstructure of elastically straining a 6060 Al-Mg-Si alloy during natural ageing or artificial ageing has been investigated. The elastic strain is here defined as 50 % of the material yield strength. All heat treatments where elastic straining was applied led to an increased hardness compared to the unstrained reference material. Quantitative investigations of the precipitate microstructure using transmission electron microscopy (TEM) did not indicate any significant difference in precipitate parameters as compared to the unstrained reference material. Therefore the increased strength in the elastically strained material is being linked to strain induced dislocations based on faster ageing kinetics compared to unstrained reference samples.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 1205-1210
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.1205
• Online since: June 2014
• Authors: Eva A. Mørtsell*, Ida Westermann, Calin D. Marioara, Ketill O. Pedersen, Sigmund J. Andersen, Jostein Røyset, Randi Holmestad
• Keywords: Aluminum (Al), Elastic Straining, Precipitates, Transmission Electron Microscopy (TEM), β"

References

[1] C. D. Marioara, S. J. Andersen, J. Jansen and H. W. Zandbergen, The influence of temperature and storage time at RT on nucleation of b" phase in a 6082 Al-Mg-Si Alloy, Acta Mater., ISSN 1359-6454, vol. 51, 2003, 789-796.

DOI: 10.1016/s1359-6454(02)00470-6

[2] C. D. Marioara, S. J. Andersen, H. W. Zandbergen and R. Holmestad, The Influence of alloy composition on precipitates of the Al-Mg-Si system, Metall. Mater. Trans. A, ISSN: 1073-5623, vol. 36A, 2005, 691-702.

DOI: 10.1007/s11661-005-1001-7

[3] H.S. Hasting, A. G. Frøseth, S. J. Andersen, R. Vissers, J. C. Walmsley, C. D. Marioara, et al. J Appl Phys 2009; 106: 123527.

[4] K. Teichmann, C. D. Marioara, S. J. Andersen and K. Marthinsen, The effect of preaging deformation on the precipitation behaviour of an Al-Mg-Si alloy, Metallurgical and Materials Transactions A, ISSN: 1073-5623, DOI: 10. 1007/s11661-012-1235-0, vol. 43A(11), 4006-4014, (2012).

DOI: 10.1007/s11661-012-1235-0

[5] K. Teichmann, C. D. Marioara, K. O. Pedersen and K. Marthinsen, The effect of simultaneous deformation and annealing on the precipitation behaviour and mechanical properties of an Al-Mg-Si alloy, Materials Science and Engineering A, ISSN: 0921-5093, vol. 565, 228-235, (2013).

DOI: 10.1016/j.msea.2012.12.042

[6] ISO 6507 - 1: 2006, Metallic Materials - Vickers hardness test - Part 1: Method of test at room temperature.

[7] S.J. Andersen: Metall. Mater. Trans. A, 1995, vol. 26A, pp.1931-38.

[8] Malin Torsæther, H.S. Hasting, W. Lefebvre, C. D. Marioara, J. C. Walmsley, S. J. Andersen and Randi Holmestad, The influence of composition and natural aging on clustering during preaging in Al-Mg-Si alloys, Journal of applied physics 108, 073527, (2010).

DOI: 10.1063/1.3481090