Homogeneous Grain Refinement and Ductility Enhancement in AZ31B Magnesium Alloy Using Friction Stir Processing

  • Vivek PatelEmail author
  • Wenya Li
  • Quan Wen
  • Yu Su
  • Na Li
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Low ductility in magnesium (Mg) alloy hinders its application in material forming industries. Hence, it is indeed of the material processing technique to modify the microstructure of Mg alloy for increasing ductility. Present work aims to refine the grain size of thick AZ31B Mg alloy using friction stir processing (FSP) technique. A low heat input stationary shoulder tooling system is used for processing heat sensitive Mg alloy, exhibiting small temperature gradient across the thickness of processed material. This low heat input and small temperature gradient contributed to uniform grain refinement across the thickness due to dynamic recrystallization. Significant reduction in grain size achieved after FSP, which helped to enhance the elongation of FSP samples (top, middle, and bottom) in comparison with the unprocessed material. Furthermore, uniform and homogenous grain size and elongation obtained across the thickness of processed material, which was attributed to the stationary shoulder tooling system.


AZ31B Ductility Friction stir processing Grain refinement Magnesium Stationary shoulder 



The authors would like to thank the financial support from the National Key Research and Development Program of China (2016YFB1100104). We also want to acknowledge the editorial committee, organizer (s) of Magnesium Technology 2019, and TMS for recognizing our research work.


  1. 1.
    Thomas W, Nicholas E, Needham J, Murch M, Templesmith P, Dawes C (1991)Google Scholar
  2. 2.
    Mishra RS, Mahoney M, McFadden S, Mara N, Mukherjee A (1999) High strain rate superplasticity in a friction stir processed 7075 Al alloy. Scripta Materialia 42 (2):163–168CrossRefGoogle Scholar
  3. 3.
    Mishra RS, Mahoney MW (2001) Friction stir processing: a new grain refinement technique to achieve high strain rate superplasticity in commercial alloys. Materials Science Forum 357:507–514CrossRefGoogle Scholar
  4. 4.
    Ma ZY, Feng AH, Chen DL, Shen J (2018) Recent Advances in Friction Stir Welding/Processing of Aluminum Alloys: Microstructural Evolution and Mechanical Properties. Critical Reviews in Solid State and Materials Sciences 43 (4):269–333. Scholar
  5. 5.
    Patel VV, Li WY, Vairis A, Badheka VJ (2018) Recent Development in Friction Stir Processing as a Solid-State Grain Refinement Technique: Microstructural Evolution and Property Enhancement. Critical Reviews in Solid State and Materials Sciences. In Press.Google Scholar
  6. 6.
    Patel VV, Badheka VJ, Kumar A (2016) Effect of Velocity Index on Grain Size of Friction Stir Processed Al-Zn-Mg-Cu Alloy. Procedia Technology 23:537–542. doi: Scholar
  7. 7.
    Padhy GK, Wu CS, Gao S (2018) Friction stir based welding and processing technologies-processes, parameters, microstructures and applications: A review. Journal of Materials Science & Technology 34 (1):1–38. doi: Scholar
  8. 8.
    Patel VV, Badheka V, Kumar A (2016) Friction Stir Processing as a Novel Technique to Achieve Superplasticity in Aluminum Alloys: Process Variables, Variants, and Applications. Metallography, Microstructure, and Analysis 5 (4):278–293Google Scholar
  9. 9.
    Rathee S, Maheshwari S, Siddiquee AN, Srivastava M (2018) A Review of Recent Progress in Solid State Fabrication of Composites and Functionally Graded Systems Via Friction Stir Processing. Critical Reviews in Solid State and Materials Sciences 43 (4):334–366. Scholar
  10. 10.
    Yang K, Li WY, Niu PL, Yang XW, Xu YX (2018) Cold sprayed AA2024/Al2O3 metal matrix composites improved by friction stir processing: Microstructure characterization, mechanical performance and strengthening mechanisms. Journal of Alloys and Compounds 736:115–123. Scholar
  11. 11.
    Yang K, Li W, Huang C, Yang X, Xu Y (2018) Optimization of cold-sprayed AA2024/Al2O3 metal matrix composites via friction stir processing: Effect of rotation speeds. Journal of Materials Science & Technology. doi: Scholar
  12. 12.
    Patel VV, Badheka VJ, Kumar A (2017) Influence of Pin Profile on the Tool Plunge Stage in Friction Stir Processing of Al–Zn–Mg–Cu Alloy. Transactions of the Indian Institute of Metals 70 (4):1151–1158. Scholar
  13. 13.
    Patel VV, Badheka VJ, Patel U, Patel S, Patel S, Zala S, Badheka K (2017) Experimental Investigation on Hybrid Friction Stir Processing using compressed air in Aluminum 7075 alloy. Materials Today: Proceedings 4 (9):10025–10029. doi: Scholar
  14. 14.
    Patel VV, Badheka VJ, Zala SR, Patel SR, Patel UD, Patel SN Effects of Various Cooling Techniques on Grain Refinement of Aluminum 7075-T651 During Friction Stir Processing. In: ASME 2016 International Mechanical Engineering Congress and Exposition, 2016. American Society of Mechanical Engineers, pp V014T011A015-V014T011A015Google Scholar
  15. 15.
    Alavi Nia A, Omidvar H, Nourbakhsh SH (2014) Effects of an overlapping multi-pass friction stir process and rapid cooling on the mechanical properties and microstructure of AZ31 magnesium alloy. Materials & Design 58 (Supplement C):298–304. doi: Scholar
  16. 16.
    Darras B, Kishta E (2013) Submerged friction stir processing of AZ31 Magnesium alloy. Materials & Design 47 (Supplement C):133–137. doi: Scholar
  17. 17.
    Chang CI, Du XH, Huang JC (2008) Producing nanograined microstructure in Mg–Al–Zn alloy by two-step friction stir processing. Scripta Materialia 59 (3):356–359. doi: Scholar
  18. 18.
    Barbini A, Carstensen J, dos Santos JF (2018) Influence of a non-rotating shoulder on heat generation, microstructure and mechanical properties of dissimilar AA2024/AA7050 FSW joints. Journal of Materials Science & Technology 34 (1):119–127. doi: Scholar
  19. 19.
    Ji S, Meng X, Liu J, Zhang L, Gao S (2014) Formation and mechanical properties of stationary shoulder friction stir welded 6005A-T6 aluminum alloy. Materials & Design (1980–2015) 62:113–117CrossRefGoogle Scholar
  20. 20.
    Wen Q, Li WY, Wang WB, Wang FF, Gao YJ, Patel V (2018) Experimental and numerical investigations of bonding interface behavior in stationary shoulder friction stir lap welding. Journal of Materials Science & Technology. In Press. doi: Scholar
  21. 21.
    Patel VV, Badheka V, Kumar A (2017) Effect of polygonal pin profiles on friction stir processed superplasticity of AA7075 alloy. Journal of Materials Processing Technology 240:68–76. doi: Scholar
  22. 22.
    Patel VV, Badheka VJ, Kumar A (2016) Cavitation in Friction Stir Processing of Al-Zn-Mg-Cu Alloy. International Journal of Mechanical Engineering and Robotics Research 5 (4):317–321.
  23. 23.
    Patel VV, Badheka V, Kumar A (2016) Influence of Friction Stir Processed Parameters on Superplasticity of Al-Zn-Mg-Cu Alloy. Materials and Manufacturing Processes 31 (12):1573–1582. Scholar
  24. 24.
    Yuan W, Mishra RS, Carlson B, Mishra R, Verma R, Kubic R (2011) Effect of texture on the mechanical behavior of ultrafine grained magnesium alloy. Scripta Materialia 64 (6):580–583CrossRefGoogle Scholar
  25. 25.
    Yuan W, Mishra RS (2012) Grain size and texture effects on deformation behavior of AZ31 magnesium alloy. Materials Science and Engineering: A 558 (Supplement C):716–724. doi: Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Vivek Patel
    • 1
    • 2
    Email author
  • Wenya Li
    • 1
  • Quan Wen
    • 1
  • Yu Su
    • 1
  • Na Li
    • 1
  1. 1.Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  2. 2.Mechanical Engineering Department, School of TechnologyPandit Deendayal Petroleum UniversityGandhinagarIndia

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