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Journal of Materials Science

, Volume 43, Issue 12, pp 4208–4214 | Cite as

Effect of sensitization heat treatment on properties of Al–Mg alloy AA5083-H116

  • I. N. A. OguochaEmail author
  • O. J. Adigun
  • S. YannacopoulosEmail author
Article

Abstract

Al–Mg alloy AA5083 is a sheet and plate alloy used mainly for marine application as well as for structural components in transportation and military applications. The strength is derived from solid solution strengthening and strain hardening. The properties of as-received and sensitized samples of AA5083-H116 were investigated using microhardness measurements, tensile testing, optical microscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), and Nitric Acid Mass Loss Test (NAMLT). The results show that both chemical and mechanical properties of the alloy decreased with increasing sensitization temperature and time. The deterioration in chemical property, which was measured in terms of the level of susceptibility to Intergranular Corrosion (IGC), is attributed to grain boundary precipitation of magnesium-rich particles. The loss in tensile and hardness properties is attributed to softening caused partly by decrease in Mg solute solid solution concentration with increasing sensitization time and temperature and partly by recrystallization at elevated temperatures.

Keywords

Stress Corrosion Crack Sensitization Temperature Al3Mg2 Intermetallic Particle Slow Strain Rate Test 

Notes

Acknowledgements

The authors would like to thank the Natural Science and Engineering Research Council (NSERC) for Discovery Grants given to Prof. S. Yannacopoulos and Prof. I. N. A. Oguocha and Dr. A. K. Gupta of Alcan Aluminum Limited, Kingston, Ontario, Canada, for supply of test materials and scientific input. We also thank Prof. M. C. Chaturvedi at the University of Manitoba, Winnipeg, for making use of his SEM and EDS facilities.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of SaskatchewanSaskatoonCanada
  2. 2.School of EngineeringThe University of British Columbia OkanaganKelownaCanada

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