Layered Microstructure Generated by Multipass Friction Stir Processing in AZ91 Alloy and Its Effect on Fatigue Characteristics

  • Raja Allavikutty
  • Vivek PancholiEmail author
  • Banu K. Mishra
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)


Layered microstructure with three different configurations was developed by multipass friction stir processing (FSP) on as-cast (AC) AZ91 magnesium alloy using three different tools with probe lengths 7, 5 and 4 mm. They were half thickness processed (HFSP), surface modified (SFSP) and full thickness processed (FFSP). FSP was performed at tool rotation rate of 720 rpm and transverse speed of 150 mm/min. The large β-Mg17Al12 particles with an average size of 20 μm and α-Mg matrix grains of 100 μm were reduced to approximately 1 and 2 μm, respectively, after multipass FSP. Texture of FSPed samples measured by X-ray diffraction technique had shown basal texture. Constant amplitude axial fatigue test was performed on all the microstructural configurations, with process direction parallel to loading axis. Life of the fatigue tested samples was found to increase with the increasing fraction of FSPed region in AZ91 alloy.


Fatigue Microstructure variation Multipass FSP AZ91 alloy Texture 


  1. 1.
    Fleming S (2012) An overview of magnesium based alloys for aerospace and automotive applications. Rensselaer Polytechnic Institute, HartfordGoogle Scholar
  2. 2.
    Ni DR, Wang D, Feng AH, Yao G, Ma ZY (2009) Enhancing the high-cycle fatigue strength of Mg–9Al–1Zn casting by friction stir processing. Scr Mater 61:568–571CrossRefGoogle Scholar
  3. 3.
    Cavaliere P, De Marco PP (2007) Fatigue behaviour of friction stir processed AZ91 magnesium alloy produced by high pressure die casting. Mater Charact 58:226–232CrossRefGoogle Scholar
  4. 4.
    Liu WC, Dong J, Zhang P, Korsunsky AM, Song X, Ding WJ (2011) Improvement of fatigue properties by shot peening for Mg–10Gd–3Y alloys under different conditions. Mater Sci Eng A 528:5935–5944CrossRefGoogle Scholar
  5. 5.
    Tajiri A, Uematsu Y, Kakiuchi T, Tozaki Y, Suzuki Y, Afrinaldi A (2015) Effect of friction stir processing conditions on fatigue behavior and texture development in A356–T6 cast aluminum alloy. Int J Fatigue 80:192–202CrossRefGoogle Scholar
  6. 6.
    Sharma S (2004) Effect of friction stir processing on fatigue behavior of A356 alloy. Scr Mater 51:237–241CrossRefGoogle Scholar
  7. 7.
    Mishra RS, Ma ZY (2005) Friction stir welding and processing. Mater Sci Eng R Rep 50:1–78CrossRefGoogle Scholar
  8. 8.
    Ma ZY, Pilchak AL, Juhas MC, Williams JC (2008) Microstructural refinement and property enhancement of cast light alloys via friction stir processing. Scr Mater 58:361–366CrossRefGoogle Scholar
  9. 9.
    Asadi P, Besharati Givi MK, Akbari M (2016) Simulation of dynamic recrystallization process during friction stir welding of AZ91 magnesium alloy. Int J Adv Manuf Technol 83:301–311CrossRefGoogle Scholar
  10. 10.
    Jain V, Yuan W, Mishra RS, Gupta AK (2012) Directional anisotropy in the mechanical behavior of friction stir processed and aged AZ91 alloy. pp 64–67Google Scholar
  11. 11.
    Agnew SR, Tom CN (2003) Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling. Scr Mater 48:1003–1008CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Raja Allavikutty
    • 1
  • Vivek Pancholi
    • 1
    Email author
  • Banu K. Mishra
    • 2
  1. 1.Department of Metallurgical and Materials EngineeringIndian Institute of Technology RoorkeeRoorkeeIndia
  2. 2.Department of Mechanical and Industrial EngineeringIndian Institute of Technology RoorkeeRoorkeeIndia

Personalised recommendations