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Experimental and Theoretical Studies of the Hot Tearing Behavior of Al-xZn-2Mg-2Cu Alloys

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Abstract

The effect of Zn addition on the hot tearing susceptibilities of non-refined Al-xZn-2Mg-2Cu (x = 2-12 wt pct) alloys was investigated via direct crack observations and load response measurements. The obtained experimental results were compared with the predictions made using a modified Rappaz–Drezet–Gremaud (RDG) hot tearing model. Both the minimum crack width and load at the non-equilibrium solidus (NES) temperature (which served as a good indicator of hot tearing response) were observed at a Zn concentration of approximately 4 wt pct, and the formation of cracks was highly correlated with the predictions made via the modified RDG hot tearing model (although the obtained relationship critically depended on the magnitude of fraction solid at which solid coalescence was expected to occur). Furthermore, it was confirmed from the load development pattern that the addition of Zn into the matrix of Al-xZn-2Mg-2Cu alloys promoted the formation of coalesced networks, which decreased their corresponding coalescence fraction solids.

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Acknowledgments

This study was supported by the Major State Research and Development Program of China (Grant No. 2016YFB0300801), the National Natural Science Foundation of China (Grant No. 51671017), the Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, the Fundamental Research Funds for the Central Universities (Grant No. FRF-BR-15-078A), and the Opening Research Fund of State Key Laboratory for Advanced Metals and Materials (Grant Nos. 2014ZD-02 and 2015-ZD08).

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Y. Li, X. Gao, Z. R. Zhang, W. L. Xiao, H. X. Li, J. S. Zhang & L. Z. Zhuang

  2. SINTEF Materials and Chemistry, Trondheim, Norway

    Q. Du

  3. Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands

    L. Katgerman

  4. Tata Steel, 1970 CA, Ijmuiden, The Netherlands

    L. Z. Zhuang

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  1. Y. Li
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  2. X. Gao
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Correspondence to H. X. Li or L. Z. Zhuang.

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Manuscript submitted May 6, 2017.

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Li, Y., Gao, X., Zhang, Z.R. et al. Experimental and Theoretical Studies of the Hot Tearing Behavior of Al-xZn-2Mg-2Cu Alloys. Metall Mater Trans A 48, 4744–4754 (2017). https://doi.org/10.1007/s11661-017-4251-2

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  • DOI: https://doi.org/10.1007/s11661-017-4251-2

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