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Effect of Alternative Electromagnetic Vibration on Joining of 2024 Aluminum Alloy

Nikzad, Siamak | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45437 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Ashuri, Hossein
  7. Abstract:
  8. 2024 Aluminum alloy has an abundant application in the aerospace and automobile industries. One of the most important problems of the alloy is hot cracking during the fusion welding process. It is stated that the solidified grains can be refined by a static magnetic field and an alternative electric field applied simultaneously during solidification. To make the alternative electric field, an alternative current was passed through the specimen. In order to prevent hot cracking, electromagnetic vibration was used. Then the effect of intensity of the static magnetic field and alternative electric current on joint was examined. Joining was carried out at electric currents of 40, 60, and 80A and magnetic flux of 75, 110, and 145 mT. After joining, samples were cooled by argon gas and then water. The microstructure and mechanical properties of the welded samples were studied under different condition of an electromagnetic vibration. The Optimum condition obtained when electromagnetic vibration was produced at 60A and 145mT in which the average particle size of the dendrites was roughly 65µm. The hardness and shear ultimate strength increased by 12% and 10% ,respectively, and the average of the dendrite particle size decreased by 75% when electric current was increased from 40A to 60A ,and magnetic flux was increased from 75mT to 145mT
  9. Keywords:
  10. Shear Punch Test ; Aluminum Alloy 2024 ; Semisolid Joining ; Electromagnetic Vibration

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