Article Sidebar

Submitted
Apr 17, 2017
Published
Dec 1, 2001
Download
PDF
Statistic
Read Counter : 366 Download : 194

Main Article Content

Abstract

 Aluminum - Magnesium - Silicon (Al-Mg-Si) 6063 alloy was heat-treated using under aged, peak aged and overage temperatures. The numbers of cycles required to cause the fatigue fracture, at constant stress, was considered as criteria for the fatigue resistance. Moreover, the fractured surface of the alloy at different aging conditions was evaluated by optical microscopy and the Scanning Electron Microscopy (SEM). The SEM micrographs confirmed the cleavage surfaces with well-defined fatigue striations. It has been observed that the various aging time and temperature of the 6063 Al-alloy, produces different modes of fractures. The most suitable age hardening time and temperature was found to be between 4 to 5 hours and to occur at 460 K. The increase in fatigue fracture property of the alloy due to aging could be attributed to a vacancy assisted diffusion mechanism or due to pinning of dislocations movement by the precipitates produced during aging. However, the decrease in the fatigue resistance, for the over aged alloys, might be due to the coalescence of precipitates into larger grains.

 

Keywords

Age Hardening Fatigue Fracture Precipitation Hardening.

Article Details

References

  1. ANERSON, W.A. 1959. Precipitation Hardening Aluminum Base Alloy, in: Precipitation from Solid Solution, American Society for Metals: 150-207. BLAZ, L and EVANGELISTA, E. 1996. Strain Rate Sensitivity of Hot Deformed Al and Al-Mg-Si Alloy, Materials Science and Engineering A, A 207: 192-201 HELBY, M. 1993. Aluminum Extrusion A Flexible Approach to Construction, Materials World, 1: 101-102. HUNSICKER, H.Y. 1967. Metallurgy of Heat Treatment, Aluminum, American Society for Metals, Metal Park, Ohio, 1: 109-161, JIANG, D.M., HONG, B.D. and LEI, T.C. 1990 a. Fatigue Fracture Behaviour of an Under aged Al-Si-Mg Alloy. Scripta Metallurgica, 24: 651-654. JIANG, D.M, HONG, B.D. and LEI, T.C. 1990 b. Influence of Composition and Dispersoid on Fatigue Fracture Behaviour of Al-Mg-Si Alloys, Acta Metallurgica Sinica 26(5): A388-A390
  2. JIANG, D.M., HONG, B.D. LEI, T.C., DO .A. and LORIMER, G.W.1991. Influence
  3. of Aging Condition on Tensile and Fatigue Fracture Behaviour of Aluminum Alloy 6063,
  4. MU se in 6063 Alloy and Effect of Quench
  5. , 951-954.
  6. Alloy, Corrosion Prevention and Control 38(6): 141-144.
  7. f Material Science, 29(6): 1652-1655.
  8. ZAJ
  9. of Aluminium-Mg-+++Si Alloys, Micro
  10. Rece
  11. WNHAM, D
  12. Material Science and Technology; 7: 1010-1014. SULIN, I. and CELLIERS, O.C. 1990. Role of Mangane
  13. Sensitivity in 6063. Light Metal Proc. 119 TMS Annu. Meet. Publ. by Minerals, Metal and Materials, Metal and Material Soc. (TMS), Warrendale PA, USA
  14. OKORAFOR, O.E. 1991. Effect of Heat Treatment on the Corrosion Resistance of 6063 Aluminum
  15. ONURLU, S., and TEKIN, A. 1994. Effect of Heat Treatment on the Insoluble Intermetallic Phase Present in an AA 6063 Alloy. Journal o
  16. THORNTON, P.A. and COLANGELO, V.J. 1985. Fundamentals of Engineering Materials, Prentice-Hall International, pp 450-460.
  17. VAN DEN AVYLE, J.A. and SUTHERLAND, H.J.1988. Fatigue Characterization of a VAWT Blade Material, Eight ASME Wind energy Symposium, Houston, TX, USA, 22-25 January,
  18. ASME, Solar Energy Division (Publication) SED , 7: 125-129 AC, S., HUTCHINSON, B., JOHANSON, A., GULLMAN, L.O. and LAGNEBORG, R. 1993.Microstructure Control and Extrudability
  19. alloyed with Manganese, Journal De Physique. 3(7): 251-254.