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Effect of Yttrium on Hot Tearing Susceptibility of Mg–6Zn–1Cu–0.6Zr Alloys

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Abstract

The effect of Yttrium (Y) addition on hot tearing susceptibility of Mg–6Zn–1Cu–xY–0.6Zr (x = 0, 1, 2, 3) alloys was investigated using a constrained rod casting apparatus which monitored the hot tearing formation with a load sensor and a data acquisition system. The solidification characterization of the investigated alloys was studied through thermal analysis. The thermal analysis results revealed that as-cast Mg–6Zn–1Cu–xY–0.6Zr alloys are composed of primary α-Mg dendrites and several types of second phases, MgZnCu, MgZn2, Mg3YZn6 and/or Mg3Y2Zn3. The hot tearing susceptibility is affected by the addition of Y content that significantly decreases the hot tearing susceptibility of Mg–6Zn–1Cu–xY–0.6Zr alloys due to the grain refinement and high feeding capacity. In addition, the analysis of microstructures and fracture surfaces indicated that liquid film theory and feeding theory are mainly dominant on the hot tearing mechanisms.

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Acknowledgements

Thanks should be given to Innovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang (No. RC180111), Doctoral Scientific Research Foundation of Liaoning Province (No. 20170520033), National Natural Sciences Foundation of China (No. 51504153) and Key Common Technical Difficulties in the Innovation Challenge Competition (Ningbo) for their financial supports.

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Authors and Affiliations

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

    Guannan Zhu, Zhi Wang, Wuyan Qiu, Ye Zhou, Le Zhou, Feng Wang, Zheng Liu & Pingli Mao

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  1. Guannan Zhu
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  2. Zhi Wang
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  3. Wuyan Qiu
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  4. Ye Zhou
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  5. Le Zhou
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  6. Feng Wang
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  7. Zheng Liu
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  8. Pingli Mao
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Correspondence to Zhi Wang.

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Zhu, G., Wang, Z., Qiu, W. et al. Effect of Yttrium on Hot Tearing Susceptibility of Mg–6Zn–1Cu–0.6Zr Alloys. Inter Metalcast 14, 179–190 (2020). https://doi.org/10.1007/s40962-019-00352-x

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