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Effects of Quench Rate on Mechanical Properties and Microstructures of High-Strength 7046A Aluminum Alloy

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

The Jominy end-quench (JEQ) test was adopted to investigate the quench sensitivity of Al-6.6Zn-1.8Mg-0.23Cu-0.22Mn-0.21Zr (7046A) alloy. The mechanical properties of the aged alloy were studied by means of a hardness and tensile property test, whereas microstructure observation was realized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show the following: (I) inhomogeneity exists in the mechanical properties of as-aged alloy and they generally decrease with the distance from the quenched end of the bar (D) where the depth of losing 10% of maximum hardness is 196 mm. (II) Average cooling rates decreased with the increase of D. When the critical average cooling rate is about 1 K s−1, 90% of the maximum hardness can be obtained. (III) On the other hand, the influence of Al3Zr dispersoids and Al6Mn dispersoids on the precipitate behavior of MgZn2 was studied, indicating that Al3Zr and Al6Mn were effective heterogeneous precipitates sites in the slow quenching process.

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Acknowledgements

This work was financially supported by the Guangdong Province Scientific and Research Plan Project (2016B090931004), and the authors thank the Guangdong Haomei Aluminum Co., Ltd. providing hot-extrusion 7046A aluminum alloy.

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Authors and Affiliations

  1. School of Material Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Fuqing Jiang, Jiwu Huang, Lei Tang, Fenxiang Wang, Quanfeng Xiao & Zhimin Yin

  2. Key Laboratory of Nonferrous Metallic Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, People’s Republic of China

    Jiwu Huang & Zhimin Yin

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  1. Fuqing Jiang
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  3. Lei Tang
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Correspondence to Jiwu Huang.

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Jiang, F., Huang, J., Tang, L. et al. Effects of Quench Rate on Mechanical Properties and Microstructures of High-Strength 7046A Aluminum Alloy. JOM 71, 1722–1730 (2019). https://doi.org/10.1007/s11837-018-3153-0

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  • DOI: https://doi.org/10.1007/s11837-018-3153-0

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