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Annealing Behavior during Heating Rate of Ultrafine-Grained 5052 Al Alloy deformed at Cryogenic Temperature

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Abstract:

The microstructural evolution during thermal annealing of a cryogenic rolled 5052 Al alloy was investigated. The activation energy for annealing behavior was calculated using DSC data. For the heating rate of 16°C/min, the precipitation occurred at the annealing temperature of 150~230°C due to Mg self diffusion, recovery occurred at the annealing temperature of 230~260°C, and recrystallization proceeded at a higher temperature up to about 370°C. Both recovery and recrystallization gave rise to non-uniform, bimodal grain-size distributions, which may result from heterogeneous nanostructures. In addition, the activation energy for the precipitation was found as ~115kJ/mol, indicating the process was diffusion-controlled (Mg in Al), and the activation energy for recovery was found to be ~140kJ/mol, representing self-diffusion in pure Al.

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Periodical:

Materials Science Forum (Volumes 558-559)

Pages:

735-740

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.558-559.735

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Online since:

October 2007

Authors:

Ui Gu Gang, Dae Bum Park, Won Jong Nam

Keywords:

Activation Energy, Aluminium Alloy, Cryogenic Temperature, Precipitation, Recovery, Recrystallization

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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