Metallurgical and Materials Transactions A

, Volume 45, Issue 9, pp 4073–4088 | Cite as

Strain Rate Sensitivity, Work Hardening, and Fracture Behavior of an Al-Mg TiO2 Nanocomposite Prepared by Friction Stir Processing

  • Farzad Khodabakhshi
  • Abdolreza Simchi
  • Amirhossein Kokabi
  • Martin Nosko
  • Peter Švec
Article
First Online:

Abstract

Annealed and wrought AA5052 aluminum alloy was subjected to friction stir processing (FSP) without and with 3 vol pct TiO2 nanoparticles. Microstructural studies by electron backscattered diffraction and transmission electron microscopy showed the formation of an ultra-fine-grained structure with fine distribution of TiO2 nanoparticles in the metal matrix. Nanometric Al3Ti and MgO particles were also observed, revealing in-situ solid-state reactions between Al and Mg with TiO2. Tensile testing at different strain rates determined that FSP decreased the strain rate sensitivity and work hardening of annealed Al-Mg alloy without and with TiO2 nanoparticles, while opposite results were obtained for the wrought alloy. Fractographic studies exhibited that the presence of hard reinforcement particles changed the fracture mode from ductile rupture to ductile-brittle fracture. Notably, the failure mechanism was also altered from shear to tensile rupture as the strain rate increased. Consequently, the fracture surface contained hemispherical equiaxed dimples instead of parabolic ones.

Keywords

TiO2 Nanoparticles Strain Rate Sensitivity Friction Stir Processing Texture Component Al3Ti 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgment

The authors thank Dr. Frantisek Simančík, Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, for useful discussions and help in performing the experiments.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Farzad Khodabakhshi
    • 1
  • Abdolreza Simchi
    • 2
  • Amirhossein Kokabi
    • 1
  • Martin Nosko
    • 3
  • Peter Švec
    • 4
  1. 1.Department of Materials Science and EngineeringSharif University of TechnologyTehranIran
  2. 2.Department of Materials Science and Engineering and Institute for Nanoscience and NanotechnologySharif University of TechnologyTehranIran
  3. 3.Institute of Materials and Machine MechanicsSlovak Academy of SciencesBratislavaSlovak Republic
  4. 4.Institute of PhysicsSlovak Academy of SciencesBratislava 45Slovak Republic

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