Characterisation of the microstructural evolution during friction stir welding of aluminium alloys: a comparative study of 5251 and 2024 alloys
- Genevois C. ,
- Deschamps A. and
- Denquin A.
- Genevois C. ,
- Deschamps A. and
- Denquin A.
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Description
In order to understand the complex interactions between deformation, recrystallisation and precipitation induced during friction stir welding, two aluminium alloys were studied: a work hardened 5251-O alloy (Al, 2.2%Mg) and a precipitation hardened 2024-T351 alloy (Al, 3.98%Cu, 1.48%Mg). The interactions were clarified using model thermomechanical treatments involving prior deformation followed by isothermal ageing in a salt bath (at 250-350 and 350-450 deg.C). The microstructural evolution was investigated by optical microscopy and hardness profiles (for HAZ, thermomechanically affected zone and nugget), while dislocation structure and precipitation state were characterised by TEM and differential scanning calorimetry.
5th International Symposium, 14-16 Sep 2004, Session 3A: Metallurgy/Microstructure/Corrosion, Paper 02
Subjects
- Aluminium and Al alloys
- Nonferrous
- Material
- 5xxx Al series
- 2xxx Al series
- Friction welding
- Welding
- Process
- Friction stir welding
- Weld zone
- Weld
- Dynamically recrystallised zone
- HAZ
- Thermomechanically affected zone
- Defects
- Deformation
- Microstructure
- Properties
- Thermal properties
- Mechanical properties
- Hardness
- Heat treatment
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