Microstructural evolution and mechanical properties of ultrafine grained AA2024 processed by accumulative roll bonding

  • Ramin Khatami
  • Arash Fattah-alhosseini
  • Yousef Mazaheri
  • Mohsen K. Keshavarz
  • Meysam Haghshenas


In this paper, ambient temperature (room temperature) accumulative roll bonding (ARB) is performed on Al2024 aluminum alloys to assess grain refining phenomenon. The microstructural evaluations show reduction in the grain size from about 25 μm to about 350 nm by a factor of ∼70 upon six cycles of ARB; X-ray diffraction patterns were used to assess the increase in the dislocation density. The yield and tensile strength of the ultrafine grained Al2024 after the sixth cycle, 465 and 492 MPa, were about 650 and 186% higher than that of the as-received sample, 62 and 172 MPa, respectively. Investigating the fractured surfaces of the tensile test specimens by scanning electron microscopy showed that ARB process alters the mode of fracture substantially; fracture surface of annealed sample consists of deep equiaxed dimples which is an indication of ductile fracture. However, this changes in the ARBed specimens to shear ductile rupture with shallow and small elongated dimples.


Al2024 Accumulative roll bonding X-ray diffraction Mechanical properties 


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Copyright information

© Springer-Verlag London 2017

Authors and Affiliations

  • Ramin Khatami
    • 1
  • Arash Fattah-alhosseini
    • 1
  • Yousef Mazaheri
    • 1
  • Mohsen K. Keshavarz
    • 2
  • Meysam Haghshenas
    • 3
  1. 1.Department of Materials EngineeringBu-Ali Sina UniversityHamedanIran
  2. 2.Department of Mining and Materials EngineeringMcGill UniversityMontrealCanada
  3. 3.Department of Mechanical EngineeringUniversity of North DakotaGrand ForksUSA

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