Journal
MATERIALS & DESIGN
Volume 50, Issue -, Pages 606-612Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.02.078
Keywords
Aluminum alloys; Electrical resistance; Hardness; Phase transformation; Small angle X-ray scattering; Solid solution decomposition
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This study aimed at investigating the structural, electrical resistivity and hardness changes of aged Al-Zn-Mg alloys. It was observed that the isothermal annealing in temperature range of 25-200 degrees C leads to the following precipitation sequence: Guinier-Preston zones -> eta'-phase -> eta-phase. The significant increase of electrical resistivity (rho) of the considered alloys was associated with the stage of GP zone decomposition. The formation of the intermediate eta'-phase was accompanied with a decrease of electrical resistivity and an increase of hardness. Non-continuous quenching was found to suppress the eta'-phase formation; while elevated quenching rates led to the formation of uniformly distributed fine precipitates in the alloy bulk. (c) 2013 Elsevier Ltd. All rights reserved.
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