Effect of sensitization heat treatment on properties of Al–Mg alloy AA5083-H116
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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.
KeywordsStress Corrosion Crack Sensitization Temperature Al3Mg2 Intermetallic Particle Slow Strain Rate Test
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.
- 2.Jones RH (1992) In: Stress corrosion cracking. ASM International, Materials Park, OhioGoogle Scholar
- 7.Windisch CF Jr, Baer DR, Engelhard MH, Danielson MJ, Jones RH (2000) Presented at the 198th meeting of the Electrochem. Soc., Phoenix, AZGoogle Scholar
- 10.Vetrano JS, Williford RE, Jones RH (1997) In: Das SK (ed) Automotive alloys I. TMS Annual Meeting. Orlando, FL, TMS Warrendale, PA, p 77Google Scholar
- 14.Van Der Hoeven JA, Zhuang L, Schepers B, De Smet P, Baekelandt JP (2002) Aluminum 78:750Google Scholar
- 16.Hatch JE (1984) In: Aluminum: properties and physical metallurgy. American Society for Metals, Metals Park, Ohio, p 353Google Scholar
- 17.Davis JR (1999) In: Aluminum and aluminum alloys. ASM Specialty Handbook, Materials Park, OHGoogle Scholar
- 18.Chen J, Morris JG (2002) In: A study to reduce age softening of AA5182 aluminum alloy. Research Report for ARCO Aluminum Corp., p 23Google Scholar
- 19.Perryman WEC, Hadden SE (1950) J Inst Metals 77:207Google Scholar
- 21.Beck AF, Sperry PR (1969) In: Fundamental aspects of stress corrosion cracking. NACE, Houston, TX, p 513Google Scholar
- 23.Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss after Exposure to Nitric Acid (NAMLT Test), ASTM G 67 (2003)Google Scholar