Microstructural study of joints produced by friction stir welding on Al-B4C metal matrix composites
- da Silva M. ,
- Gougeon P. ,
- St-Georges L. ,
- et al
- da Silva M. ,
- Gougeon P. ,
- St-Georges L. and
- Chen X.G.
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Description
Friction stir welding experiments were undertaken on butt joints of AA6063 alloys (Al, 0.45-0.9%Mg, 0.2-0.6%Si) and AA6063 matrix reinforced with 6 and 10.5 vol.% B4C, and the effect of particle concentration on welded joint microstructure and microhardness profile was investigated. Welding was performed at a rotational speed of 1500 rpm, advance speed of 600 mm/min and tool angle of 0.5 degree on parent material of thickness 4.5 mm. Two different PWHT regimes were carried out. Cross-sectional microstructure was observed by optical microscopy and SEM. Image analysis was used for quantitative evaluation of B4C particle size, shape and distribution. Vickers microhardness measurements were conducted at specific locations. Issues discussed include intermetallic phase fragmentation, grain refinement in the stir zone and abnormal grain growth in the nugget after PWHT.
7th International Symposium, 20-22 May 2008, 4B: Non Ferrous, Paper 02
Subjects
- Aluminium and Al alloys
- Nonferrous
- Material
- 6xxx Al series
- Composite materials
- Matrix composites
- Particle reinforced composites
- Microstructure
- Friction welding
- Welding
- Process
- Friction stir welding
- Mechanical properties
- Properties
- Hardness
- Grain
- Weld zone
- Weld
- Thermomechanically affected zone
- Dynamically recrystallised zone
- Heat treatment
- PWHT
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