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Strength of Materials

, Volume 50, Issue 1, pp 184–192 | Cite as

Hot Extrusion Effect on the Microstructure and Mechanical Properties of a Mg–Y–Nd–Zr Alloy

  • L. Y. Sheng
  • B. N. Du
  • B. J. Wang
  • D. K. Xu
  • C. Lai
  • Y. Gao
  • T. F. Xi
Article

Mg–Zn–Y–Nd alloy was prepared by casting and hot extrusion. The microstructure and mechanical properties of OM, SEM, XRD, TEM, and tensile tests were investigated with casting and hot extruded alloys. The results demonstrate that in a casting Mg–Y–Nd–Zr alloy, the α-Mg matrix is separated into the cell structure by a discontinuously distributed coarse Mg24Y5/α-Mg eutectic structure and fine Mg12Nd particles. TEM analysis shows that the Mg12Nd and Mg24Y5 phases have the orientation of \( {\left[001\right]}_{{\mathrm{Mg}}_{12}\mathrm{Nd}}//{\left[0221\right]}_{\upalpha -\mathrm{Mg}} \), and \( {\left[111\right]}_{{\mathrm{Mg}}_{24}{\mathrm{Y}}_5}//{\left[0001\right]}_{\upalpha -\mathrm{Mg}} \) and \( {\left(10\overline{1}\right)}_{{\mathrm{Mg}}_{24}{\mathrm{Y}}_5}//{\left(10\overline{1}0\right)}_{\upalpha -\mathrm{Mg}} \), respectively. The hot extrusion separates the Mg24Y5/α-Mg eutectic structure into fragments and aligns fragmentary Mg24Y5 particles along the extrusion direction. The interaction of hot extrusion and strengthening particles refines the α-Mg matrix greatly. Moreover, large strains result in the stacking faults of the matrix. As compared to the casting alloy, the hot-extruded one exhibits high yield strength, ultimate tensile strength, and elongation, which should be ascribed to the grain fineness, optimum distribution of strengthening particles and multiple substructures.

Keywords

Mg–Y–Nd–Zr alloy hot extrusion mechanical properties TEM microstructure 

Notes

Acknowledgments

The authors are grateful to the Shenzhen Technology Innovation Plan (CXZZ20140731091722497 and CXZZ20140419114548507) and the Strategic New Industry Development Special Foundation of Shenzhen (JCYJ20150529162228734, JCYJ20160427100211076, JCYJ20170306141749970, JCYJ20160329161539885, JCYJ 20150625155931806 and JCYJ20160427170611414) for the financial support.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • L. Y. Sheng
    • 1
  • B. N. Du
    • 1
  • B. J. Wang
    • 1
  • D. K. Xu
    • 2
  • C. Lai
    • 1
  • Y. Gao
    • 3
  • T. F. Xi
    • 1
  1. 1.Shenzhen InstitutePeking UniversityShenzhenChina
  2. 2.Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  3. 3.Department of Stomatology, Longgang District Central HospitalAffiliated to Zunyi Medical CollegeShenzhenChina

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