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Quench Sensitivity of a 7A46 Aluminum Alloy

  • Aluminum and Magnesium: High Strength Alloys for Automotive and Transportation Applications
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Abstract

The quench sensitivity of a 7A46 aluminum alloy is studied by an interrupted quench method. The temperature–time–property (TTP) curves for the electrical conductivity and hardness are determined by measuring the as-quenched electrical conductivity and as-aged hardness, respectively. The TTP curves for the electrical conductivity and hardness all show that the nose temperature is 295°C and that the temperature zone with quench sensitivity and a fast phase transformation ranges from 265°C to 325°C. Transmission electron microscopy (TEM) images show that Al3Zr particles and grain boundaries are preferred nucleation sites for coarse η phases. With the extension of the isothermal holding time at 295°C, the size and density of these coarse η phases increase, resulting in a decreasing density of GP zones and η′ phases after aging treatment, and the precipitate-free zones (PFZ) become wide. To obtain good mechanical properties of the alloy and reduce residual stress, the cooling rate should be controlled at 1°C/s in the quench-sensitive zone and appropriately reduced outside the quench-sensitive zone.

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Acknowledgements

This work was supported by the Science and Technology Major Project of Hunan Province (2016GK1004) and Guangdong Province (2016B090931001).

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Authors and Affiliations

  1. Light Alloy Research Institute, Central South University, Changsha, 411083, People’s Republic of China

    Ji Ye & Qinglin Pan

  2. School of Material Science and Engineering, Central South University, Changsha, 411083, People’s Republic of China

    Qinglin Pan, Yaru Liu & Xiangdong Wang

  3. Suntown Technology Group Co., Ltd, Changsha, 410200, People’s Republic of China

    Hang Li

  4. Guangdong Fenglu Aluminum Industry Co., Ltd, Foshan, 528100, People’s Republic of China

    Zhiqi Huang

  5. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, People’s Republic of China

    Mengjia Li

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  1. Ji Ye
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  2. Qinglin Pan
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  3. Hang Li
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Correspondence to Qinglin Pan.

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Ye, J., Pan, Q., Li, H. et al. Quench Sensitivity of a 7A46 Aluminum Alloy. JOM 71, 2054–2062 (2019). https://doi.org/10.1007/s11837-019-03421-y

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  • DOI: https://doi.org/10.1007/s11837-019-03421-y

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