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Dissimilar Friction Stir Welding between Aluminum Alloy and Magnesium Alloy

Sadeghi Alavijeh, Ali Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40220 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Seyed Reihani, Morteza
  7. Abstract:
  8. In this project, Dissimilar Friction Stir Welding (FSW) between aluminum alloys (1100-H12 and 5083-O) and Magnesium alloy (AZ31B-O) with 3mm thickness were butt joined. Fusion welding of aluminum/magnesium alloys has failed because of forming much more intermetallic compounds. By using friction stir welded samples, effect of welding parameters such as tool travel speed, tool rotation rate, tool position respect to weld centerline, and sheet position respect to tool direction on mechanical (tensile strength, yield strength and elongation) and microstructural properties of the welds were investigated. After several tests, range of optimum parameters were obtained. In both 1100 and 5083 alloys, when the rotating tool put more in AZ31B and AZ31B was on the advancing side, defect-free welds obtained. For Al-1100 alloy, for tool rotation rate from 400-800 rpm and tool travel speed from 15-30 mm/min and for Al-5083 alloy, for tool rotation rate from 400-600 rpm and tool travel speed from 10-30 mm/min leaded to sound welds. Effect of welding parameters on formation of intermetallic phases by microstructural examinations utilizing XRD and SEM were studied. Higher hardness of weld nugget respect to HAZ and base metal proved the formation of brittle phases. By using tensile tests on defect-free samples, parameters which lead to maximum tensile strength were determined
  9. Keywords:
  10. Aluminum Alloy ; Magnesium Alloy ; Microstructure ; Mechanical Properties ; Dissimilar Friction Stir Welding

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