Microstructure and deformation behavior of friction stir welded light metals
- Gutensohn M. ,
- Klag O. ,
- Wagner G. ,
- et al
- Gutensohn M. ,
- Klag O. ,
- Wagner G. and
- Eifler D.
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Description
Friction stir welding was employed to fabricate joints in aluminium and magnesium alloys, and the weld zone microstructure and plastic deformation behaviour were investigated. The materials tested were AA 5454-H22 (Al, 2.85%Mg) wrought alloy sheets (thickness 3.5 mm) and AZ91D (Mg, 8.75%Al, 0.65%Zn) die cast alloy plates (thickness 7.5 mm). Process conditions included tool shoulder diameter of 15 mm, rotational speed of 1500 rpm and welding speed of 200 mm/min for AA 5454, with corresponding values of 25 mm, 1200 rpm and 100 mm/min for AZ91. Microstructure was observed by optical microscopy. Mechanical properties were characterised by tensile and fatigue tests. Defect structure and pore density were studied by electrical resistance measurements and ultrasonic testing.
7th International Symposium, 20-22 May 2008, 7B: Microstructure 2, Paper 01
Subjects
- Friction welding
- Welding
- Process
- Friction stir welding
- Aluminium and Al alloys
- Nonferrous
- Material
- 5xxx Al series
- Magnesium and Mg alloys
- Microstructure
- Defects
- Deformation
- Process conditions
- Strength
- Mechanical properties
- Properties
- Ultimate tensile strength
- Fatigue strength
- Weld zone
- Weld
- Dynamically recrystallised zone
- Weldability
- Cavities
- Castings
- Cracking
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