Distributions of hardness and microstructure in friction stir weld of Al alloy 6063
- Sato Y.S. ,
- Kokawa H. ,
- Enomoto M. ,
- et al
- Sato Y.S. ,
- Kokawa H. ,
- Enomoto M. ,
- Jogan S. and
- Hashimoto T.
September 2001
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The relationship between microstructure and hardness was investigated in friction stir welded aluminium alloy 6063-T5. The alloy thickness was 6 mm. Hardness profiles were measured across the stir zone. The microstructure of the as-welded and postweld-aged welds was examined using optical microscopy and TEM. The stir zone consisted of fine recrystallised grains. The thermomechanically affected zone contained recovered grains with a high density of sub-boundaries. Hardness in the weld was reduced around the weld centre. Postweld ageing increased the hardness. The hardness profile was strongly influenced by precipitate distribution.
3rd International Symposium, 27-28 Sep 2001, Session 6: Metallurgy, Paper 04
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