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Effect of Al Content on Hot-Tearing Susceptibility of Mg-10Zn-xAl Alloys

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Abstract

The hot-tearing susceptibility of Mg-10Zn-xAl (x = 0, 2, 5, and 7) alloys was studied using constrained rod casting installed with a load cell, thermocouple, and data-management system. Addition of Al content reduced the freezing range and increased the liquid fraction at the end of the primary stage of solidification, during the vulnerable period of alloy solidification. Eutectic healing was observed in alloys containing Al cast at a higher initial mold temperature due to near-equilibrium solidification. Grain refining was confirmed at the microstructural level due to addition of Al. The results also suggested that increasing Al content enabled hot-tearing resistance of Mg-10Zn alloy by facilitating liquid feed for the strain developed during the mid-stage of solidification (0.65Fs to 0.74Fs). Experimental results were compared with Pandat’s simulation results to predict the occurrence of hot tearing in Mg-10Zn-xAl alloys. This indicated that Pandat’s solidification curve could be used to determine the hot-tearing nature of Mg-Zn alloys. The recently proposed hot-tearing criteria of Kou and Clyne–Davie roughly agreed with the experimental results, but did not perfectly predict the influence of different casting conditions.

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Acknowledgments

The Major Science and Technology projects in Qinghai province (2018-GX-A1) and the National Key R&D Program (No. 2016YFB0301002) supported by the Ministry of Science and Technology of China is acknowledged. This work was co-funded by the National Natural Science Foundation of China (Nos. 51301107, 51474149). D.J. Li acknowledges the financial support received from Shanghai Jiao Tong University through SMC-Young scholar program.

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Authors and Affiliations

  1. National Engineering Research Centre of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    G. Vinodh, H. R. Jafari Nodooshan, Dejiang Li & Xiaoqin Zeng

  2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    Xiaoqin Zeng

  3. General Motors China Science Laboratory, Shanghai, 201206, P.R. China

    Bin Hu

  4. General Motors Research & Development Centre, Warren, MI, 48090, USA

    Jon T. Carter & Anil K. Sachdev

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  1. G. Vinodh
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Manuscript submitted November 26, 2018.

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Vinodh, G., Jafari Nodooshan, H.R., Li, D. et al. Effect of Al Content on Hot-Tearing Susceptibility of Mg-10Zn-xAl Alloys. Metall Mater Trans A 51, 1897–1910 (2020). https://doi.org/10.1007/s11661-020-05657-9

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