Effects of Y Additions on the Microstructures and Mechanical Behaviours of as Cast Mg–xY–0.5Zr Alloys

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Authors

  • Sihang You
  • Yuanding Huang
  • Hajo Dieringa
  • Emad Maawad
  • Weimin Gan
  • Yaping Zhang
  • Karl Ulrich Kainer
  • Regine Willumeit-Römer
  • Norbert Hort

Previous investigations demonstrated that rare-earth elements (REs) could improve their creep properties effectively. Herein, the influence of Y content on the creep properties of magnesium is investigated systematically with different amount of Y additions. The mechanisms responsible for creep deformation are clarified by the analysis of stress exponent and microstructural characterizations. It is found that the addition of Y in Mg can improve both the ambient strength and high temperature strength owing to its effective solid solution strengthening. At room temperature, the yield strength of Mg–Y alloys has a linear relation with the content of Y. When tested at high temperatures, the yield strength reduces. Compared with pure magnesium, Mg–Y alloys exhibit a high thermal stability even above 200 °C. Small amount of Y addition can improve the creep resistance of Mg largely. With further increasing its content, its contribution to the improvement of creep resistance is weakened for Mg. Under the applied stresses 60–100 MPa and at temperatures of 200–250 °C, the responsible creep mechanism is dislocation controlled. During creep deformation, the Y segregation regions play an important role in hindering the movement of dislocations.

Original languageEnglish
Article number2101033
JournalAdvanced Engineering Materials
Volume24
Issue number4
Number of pages10
ISSN1438-1656
DOIs
Publication statusPublished - 01.04.2022

Bibliographical note

Funding Information:
The authors acknowledge Mr. G. Meister for preparing the alloys. S.Y. gratefully thanks the China Scholarship Council (201506120049) for the award of a fellowship and funding. The authors acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at the P07 beamline. Open access funding enabled and organized by Projekt DEAL.

Funding Information:
The authors acknowledge Mr. G. Meister for preparing the alloys. S.Y. gratefully thanks the China Scholarship Council (201506120049) for the award of a fellowship and funding. The authors acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at the P07 beamline.

Publisher Copyright:
© 2021 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH.

    Research areas

  • Engineering
  • creep deformation, magnesium alloys, mechanical properties, microstructures

DOI