Effect of Recrystilisation Annealing on Grain Refinement for Superplasic Forming of cold-rolled aluminium Alloy 5083
The development of primary recrystallisation in cold-rolled alloy 5083 and the resulting morphology of grains formed were investigated by methods of low frequency internal friction and metallography. A non-relaxation related asymmetrical peak was found in the internal friction temperature dependencies of cold-rolled alloy 5083 in the vicinity of 300 degrees Celsius. Nucleation and growth of grains during primary recrystallisation affect the high-temperature side of the observed peak. It was shown, that the cold rolling reduction ratio renders an insignificant effect on the position of the peak on the temperature axis, while an increase of the heating rate from 3 to 10 degrees Celsius per minute results in a shift of it by 35 degrees Celsius to higher temperatures. Internal friction data and metallographic observations allow to formulate optimal parameters for mechanical and thermal treatments prior to superplastic forming of alloy 5083 at temperatures which are approximately 50- 70 degrees Celsius below those used at present.
Bibliographic Reference: Oral Report delivered at: Euromat 2000 Conference on Advances in Mechanical Behaviour, Plasticity and Damage, Hosted in: Tours (FR) 7-9 November 2000
Record Number: 200012996 / Last updated on: 2001-01-24
Original language: en
Available languages: en