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Ghahreman, H., Ebrahimi, M., Es'haghi Oskui, A., Zadshakoyan, M. (2023). Mode I Fracture Behavior of 6061 Aluminum Alloy Processed by Friction Stir Processing. Electronic and Cyber Defense, 19(2), 83-94.
Hadi Ghahreman; Mahmoud Ebrahimi; Abuzar Es'haghi Oskui; Mohammad Zadshakoyan. "Mode I Fracture Behavior of 6061 Aluminum Alloy Processed by Friction Stir Processing". Electronic and Cyber Defense, 19, 2, 2023, 83-94.
Ghahreman, H., Ebrahimi, M., Es'haghi Oskui, A., Zadshakoyan, M. (2023). 'Mode I Fracture Behavior of 6061 Aluminum Alloy Processed by Friction Stir Processing', Electronic and Cyber Defense, 19(2), pp. 83-94.
Ghahreman, H., Ebrahimi, M., Es'haghi Oskui, A., Zadshakoyan, M. Mode I Fracture Behavior of 6061 Aluminum Alloy Processed by Friction Stir Processing. Electronic and Cyber Defense, 2023; 19(2): 83-94.

Mode I Fracture Behavior of 6061 Aluminum Alloy Processed by Friction Stir Processing

مکانیک هوافضا
Article 7, Volume 19, Issue 2 - Serial Number 72, September 2023, Pages 83-94    PDF (1.74 M)
Document Type: Manufacturing and Production
Authors
Hadi Ghahreman1; Mahmoud Ebrahimi* 2; Abuzar Es'haghi Oskui3; Mohammad Zadshakoyan4
1M.Sc., Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
2Corresponding author: Associate Professor, Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
3Postdoctoral researcher,, Department of Mechanics and Aerospace Engineering, College of Engineeringو Southern University of Science and Technology, Shenzhen, China
4Associate Professor, Department of Manufacturing and Production Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
Receive Date: 06 December 2022,  Revise Date: 26 January 2023,  Accept Date: 07 February 2023 
Abstract
Crack nucleation mechanisms, its growth, and the determination of critical failure parameters are of industrial importance. Therefore, it is inevitable to study the mechanical behavior of cracked materials under applied load during severe plastic deformation. The present study studied the mode I fracture behavior, mechanical properties, and microstructure characterization of the 6061 aluminum alloy fabricated by friction stir processing (FSP). For this purpose, a milling machine made a perfect stirring zone to perform the FSP method with the specific non-consumable tool. According to the tensile test results, the yield and ultimate tensile strength of the FSP-processed sample have increased by 39% and 37%, respectively. Based on the three-point bending test, the fracture toughness of the processed aluminum was calculated as 10.86 MPa√m, which shows a 14.3% improvement compared to the as-received annealed state. Eventually, the average grain size of the annealed and processed samples was measured as 35 and 15, respectively, which indicated a 57% reduction in the aluminum grain size after FSP. Note that this grain refinement is associated with improved strength and toughness.

Highlights
  • The yield and ultimate tensile strength of the FSP-processed sample increased by 39% and 37%, respectively, compared to the as-received annealed sample.
  • The fracture toughness of the FSP-processed sample was equal to 10.86 MPa√m, which showed a 14.3% increase compared to the annealed condition.
  • About 57% reduction was obtained on the average grain size of the FSP-processed sample compared to the annealed state.
Keywords
Severe plastic deformation; Friction stir processing; Fracture mechanics; Fracture toughness; Crack growth
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