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The Effect of Hot and Cold Rolling on Microstructure and Mechanical Properties of Al-Mg6

Mostafaei, Mohammad Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42173 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen
  7. Abstract:
  8. In this research, a comprehensive examination on hot and cold deformation of Al-Mg6 alloy has been performed. In order to find out hot deformation behavior of Al-Mg6, hot compression tests at 350, 450, and 550 oC and at strain rates of 0.001, 0.1, and 1 s-1 have been carried out. After the correction of the curves due to friction and adiabatic heating effects, constitutive equation of this alloy has been derived. Corrected curves show the occurrence of dynamic recovery. A new method for developing strain dependent constitutive equation has been employed using normalized stress and strain curve. After normalization, the curves at all deformation conditions follow a similar behavior.Rolling of Al-Mg6 in the conditions of as-cast and wrought has been performed at four reductions. Hot rolling is carried out at 350 oC. Cold rolling is followed with annealing at 350, 450, and 550 oC. The results show that recrystallization does not occur at hot rolled and annealed cold rolled samples. The mechanical properties of cold rolled Al-Mg6 are similar for both cast and wrought alloys. For the hot rolled alloys, also this difference is not appreciable. For the annealed sample after cold rolling, with increasing annealing temperature the wrought alloys reach higher strength and ductility in comparison with the cast one. Ultra-fine segregations on dislocations and the dissolution of them, accumulation of dislocation due to deformation and the recovery of mechanical properties have been known as the main causes of variation of mechanical properties of the rolled alloy.

  9. Keywords:
  10. Recovery ; Hot Rolling ; Aluminum Alloy Series 5xxx ; Constitutive Equations ; Anneal

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