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Influence of Natural Aging Time and Mg/Si Ratio (Mg + Si = 1.3 mass%) on the Two-Step Aging Behavior in Al–Mg–Si Alloys

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Abstract

Two-step aging with the different natural aging times and chemical compositions was carried out in Al–Mg–Si alloys to investigate the clustering and two-step aging behavior. The activation energies of cluster formation through the Kissinger method were analyzed as 69.4, 67.3 and 73.8 kJ/mol for the 9M4S, 6M6S and 3M10S, respectively. A similar hardness was identified for short-term natural aging for 3.6 ks regardless of the Mg/Si ratio. On the other hand, a lower hardness was identified in the 3M10S (Mg/Si = 0.3) than in 9M4S (Mg/Si = 2.5) and 6M6S (Mg/Si = 1) for long-term natural aging for 4838.4 ks. The hardness increase during the two-step aging was due to the formation of a β″ phase during artificial aging based on structure analysis of high resolution transmission electron microscope images. There was a hardness decrease at the initial stage of the two-step aging at 170 °C in the case of long-term naturally-aged specimens. The hardness decrease was caused by the partial dissolution of the Mg–Si co-cluster, which was influenced by the Mg/Si ratio. Meanwhile, the hardness increase during two-step aging was promoted for 6M6S and the higher number density of the β″ phase was confirmed.

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Acknowledgements

This work was supported by the Development of hot/warm forming-heat treatment integrated process for high strength aluminum alloy (PEO18272) of the Korea Institute of Industrial Technology. The authors are grateful to UACJ Corp. for the material supply. The authors thank Mr. Jong-gyun Kang, Center for University Research Facility (CURF) at Chonbuk National University, for TEM images.

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Authors and Affiliations

  1. Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology, Jeonju, 54853, Republic of Korea

    JiWoo Im, MinYoung Song & JaeHwang Kim

  2. Graduate School of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea

    JiWoo Im, MinYoung Song & SungKil Hong

  3. Suncheon Ppuri Technology Support Center, Korea Institute of Industrial Technology, Suncheon, 58022, Republic of Korea

    JaeYeol Jeon

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  1. JiWoo Im
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Im, J., Jeon, J., Song, M. et al. Influence of Natural Aging Time and Mg/Si Ratio (Mg + Si = 1.3 mass%) on the Two-Step Aging Behavior in Al–Mg–Si Alloys. Met. Mater. Int. 25, 860–868 (2019). https://doi.org/10.1007/s12540-019-00257-8

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