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Effects of Copper Content and Mold Temperature on the Hot Tearing Susceptibility of Mg-7Zn-xCu-0.6Zr Alloys

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Abstract

The effects of copper (Cu) content and mold temperature on the hot tearing susceptibility (HTS) of Mg-7Zn-xCu-0.6Zr (x = 0, 1, 2) alloys were investigated experimentally using a T-type hot tearing mold. The crack volumes were measured by paraffin permeation method, and the solidification process was analyzed by thermal analysis and by using the Clyne and Davies model. The microstructure and morphology of the crack zone of Mg-7Zn-xCu-0.6Zr alloys were characterized by scanning electron microscopy, and the composition of alloys was analyzed by X-ray diffraction. The results showed the formation of a new phase of MgZnCu in the alloys with Cu addition. Moreover, addition of Cu also led to the refinement of microstructures of Mg-7Zn-xCu-0.6Zr alloys. The HTS of Mg-7Zn-xCu-0.6Zr alloys decreased with the increase in both the content of Cu and the mold temperature.

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Acknowledgments

The authors greatly acknowledge the financial support from the National Natural Science Foundation of China (51504153 and 51571145), Shenyang Science and Technology plan 2017 project: Key Technology for Automobile Lightweight and Development of New Aluminum and Magnesium Materials and Production (17-9-6-00), and General project of scientific research of the Education Department of Liaoning Province (L2015397). The authors would also like to acknowledge the Shenyang Casting Industry Co. Ltd. for providing the ProCAST software.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, P.R. China

    Ye Zhou, Pingli Mao, Zhi Wang, Yizhou Li, Zheng Liu & Feng Wang

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  1. Ye Zhou
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  2. Pingli Mao
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  3. Zhi Wang
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  4. Yizhou Li
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Correspondence to Pingli Mao.

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Manuscript submitted May 22, 2018.

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Zhou, Y., Mao, P., Wang, Z. et al. Effects of Copper Content and Mold Temperature on the Hot Tearing Susceptibility of Mg-7Zn-xCu-0.6Zr Alloys. Metall Mater Trans B 49, 3444–3455 (2018). https://doi.org/10.1007/s11663-018-1389-2

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  • DOI: https://doi.org/10.1007/s11663-018-1389-2

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