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Effect of Nd on the Microstructure and Mechanical Properties of Hot Extruded Mg-2.0Sm-0.4Zn-0.4Zr Alloy

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Abstract

The development of magnesium alloys with superior plasticity and favorable strength is still challenging in aerospace industry. Herein, hot extruded Mg-xNd-2.0Sm-0.4Zn-0.4Zr alloys (x = 0, 0.5, 1.0, 1.5, 2.0 and 2.5 wt.%) were rationally designed and easily prepared in order to implement the favorable combination of strength and plasticity. The effects of Nd element addition on the microstructure and mechanical properties of the hot extruded alloys were systematically investigated by optical microscopy (OM), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The OM results indicated that the grain size of the hot extruded alloys decreased from 27.1 to 14.1 μm with increasing Nd addition from 0 to 2.5 wt.%. Some coarse β phases existed at the grain boundary when the addition of Nd element increased to 2.0 wt.%. The TEM results showed that the nanoscaled basal lamellar precipitates, granular precipitates and prismatic lamellar precipitates formed in α-Mg matrix. And the amount of precipitated phase increased obviously with the increase of Nd element addition. The ultimate tensile strength increased significantly from 203 ± 3.0 to 237 ± 2.5 MPa, and the elongation decreased from 30.5 to 21.2 % when the Nd elements increased from 0 to 2.5 wt.%. The fractographs of the hot extruded alloys could be classified as ductile fracture.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (51804090, 21801070, 51971086), the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (UNPYSCT-2020184).

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Authors and Affiliations

  1. School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, 150000, People’s Republic of China

    Kun Liu, Sicong Zhao, Yicheng Feng, Changliang Wang, Lei Wang & Dongrong Liu

  2. Key Laboratory of Functional Inorganic Material Chemistry (MOE), School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, People’s Republic of China

    Jingfang Li

  3. Key Laboratory of Advanced Manufacturing and Intelligent Technology, Harbin University of Science and Technology, Ministry of Education, Harbin, 150000, People’s Republic of China

    Kun Liu, Sicong Zhao, Yicheng Feng, Changliang Wang, Lei Wang & Dongrong Liu

  4. AECC HarbinDongan Engine Co.,Ltd., Harbin, 150000, People’s Republic of China

    Zhiwei Wang

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  1. Kun Liu
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Correspondence to Sicong Zhao.

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Liu, K., Zhao, S., Wang, Z. et al. Effect of Nd on the Microstructure and Mechanical Properties of Hot Extruded Mg-2.0Sm-0.4Zn-0.4Zr Alloy. J. of Materi Eng and Perform 31, 4369–4374 (2022). https://doi.org/10.1007/s11665-021-06529-y

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  • DOI: https://doi.org/10.1007/s11665-021-06529-y

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