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The Effects of ZnO Particles on the Grain Refinement and Mechanical Properties of AZ31 Magnesium Alloys

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Abstract

The grain refinement and mechanical properties of AZ31 alloy with ZnO additions were investigated using suction casting method. ZnO addition could provide a more pronounced grain refinement and strengthening effects to the AZ31 alloy than Zn solute addition did. The grain size were well refined from 325 to 220 μm with 1.3 wt% ZnO addition. The grain refining mechanism of ZnO particles (~200 nm) mainly arose from the transformed Zn solute restricting the grain growth and the micro convection by the reaction enthalpy clearing solute suppressed nucleation effects. Meanwhile, the ZnO addition provided uniform solute field and steadly ensured a fine-grain and uniform second phase distribution. With 1.3 wt% ZnO addition, the ultimate tensile strength and yielding tensile strength of suction cast AZ31 alloy were as high as 205 and 66 MPa, respectively. The refining and strengthening mechanism have been discussed in detail.

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Acknowledgments

The authors are very grateful to the National Basic Research Program of China (Grant No. 2013CB632203), and the Liaoning Provincial Natural Science Foundation of China (Grant No. 2014028027) for funding support.

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Authors and Affiliations

  1. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 314 Mailbox, Shenyang, 110819, People’s Republic of China

    Xuan Liu, Zhiqiang Zhang, Qichi Le & Lei Bao

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  1. Xuan Liu
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  2. Zhiqiang Zhang
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  3. Qichi Le
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Correspondence to Qichi Le.

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Liu, X., Zhang, Z., Le, Q. et al. The Effects of ZnO Particles on the Grain Refinement and Mechanical Properties of AZ31 Magnesium Alloys. Trans Indian Inst Met 69, 1911–1918 (2016). https://doi.org/10.1007/s12666-016-0850-7

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  • DOI: https://doi.org/10.1007/s12666-016-0850-7

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