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Impact of pre-ageing on age hardening response of twin-belt cast AlMg1SiCu sheet

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Abstract

The potential of twin-belt cast (TBC) AlMg1SiCu sheet for structural automotive applications was investigated with a particular emphasis on the impact of pre-ageing on its age hardening response. The optimum T6 process for the TBC AlMg1SiCu sheet is identified to be a water-quench from the solution heat treatment at 540 °C and a subsequent ageing treatment at 180 °C. This process gives hardness values as high as 120 HV within several hours when ageing at 180 °C is performed shortly after the solution treatment. The age hardening capacity is impaired, however, when the sheet is stored at room temperature before the artificial ageing cycle. Pre-ageing at 100 and 140 °C is effective in improving the age hardening response of the naturally aged 6061 sheet. Pre-ageing suppresses natural ageing and clustering activities and gives lower T4 yet a much higher T6 hardness.

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Acknowledgements

It is a pleasure to thank Osman Çakır and Fahri Alageyik for their help in the experimental part of the work and to ALMESAN Aluminium Co., for providing the TBC AlMg1SiCu sheet.

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  1. Materials Institute, Marmara Research Center TUBITAK, Kocaeli, Turkey

    Yucel Birol

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  1. Yucel Birol
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Correspondence to Yucel Birol.

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Birol, Y. Impact of pre-ageing on age hardening response of twin-belt cast AlMg1SiCu sheet. J Mater Sci 45, 6727–6731 (2010). https://doi.org/10.1007/s10853-010-4766-z

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  • DOI: https://doi.org/10.1007/s10853-010-4766-z

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