Precipitation phenomena in friction stir welded 6000-series aluminium alloy with paint-bake hardening response
- Sato Y.S. ,
- Abe N. ,
- Suhuddin U.F.H.R. ,
- et al
- Sato Y.S. ,
- Abe N. ,
- Suhuddin U.F.H.R. and
- Kokawa H.
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In relation to the application of tailor welded blanks of aluminium alloys to the vehicle weight reduction process, an investigation is presented into the precipitation sequence in friction stir welded 6016 alloy sheets (thickness 2 mm) during a paint-bake hardening process of 30 minutes at 180 deg.C. Welds were made at a travel speed of 2 m/min and rotational speed of 3000 rpm. Hardness profiles were measured in as-welded and bake-hardened specimens. Microstructure was examined by TEM and the precipitation sequence was established using differential scanning calorimetry. The distribution of dot-like and needle-shaped precipitates is discussed, including the effects of the baking treatment on precipitates and weld hardness. Strain of 5, 10 and 20% was introduced by longitudinal tensile testing before the bake hardening process and the effect of the strain on the hardness profile was investigated.
8th International Symposium, 18-20 May 2010, Session 4B: Metallurgy, Paper 04
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