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Title page for ETD etd-03252019-111544

Type of Document Master's Thesis
Author Sweitzer, Devany Autumn
URN etd-03252019-111544
Title Analysis of Friction Stir Welding Behavior of Aluminum Cerium Alloy and Viability for Industrial Application
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Alvin M. Strauss Committee Chair
George E. Cook Committee Co-Chair
  • friction stir welding
  • cerium
  • aluminum
  • novel
  • intermetallics
  • alloy
Date of Defense 2019-03-15
Availability unrestricted
Desire for efficiency and weight reduction in engines has propelled the search for lightweight alloys which retain high mechanical strength at extreme temperatures. A novel aluminum cerium alloy system was developed as a solution; the alloy’s production is inexpensive, and it has exceptional castability and strength at temperatures >300ºC where a typical aluminum

alloy would see significant reduction in mechanical properties. There is currently no published research on the friction stir welding (FSW) behavior of cerium-alloyed aluminum. FSW of this material would have numerous applications in the space sector and could also provide a means of repair of costly castings, returning cracked castings to near cast properties. In this thesis, the FSW behavior of an aluminum cerium alloy (Al-10Si-7Ce-4.3Cu-0.4Mg) is examined and resulting weld properties are presented; through implementation of high rotational speeds and slower traverse rates than are used for traditional aluminum FSW, an initial weld profile was formulated and adequate friction stir welds were achieved.

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