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Local atomic structures of Gd and Zn atoms in extruded Mg-Gd-Zn alloys

Journal Article


Abstract


  • Minor addition of Gd and Zn can significantly improve the mechanical properties of extruded Mg-1 wt.%Gd-xZn (x = 0, 0.5, 1 wt.%) alloys. However, how they modify the structure of alloys remains elusive. By using x-ray absorption fine structure, we found that Zn atoms tend to bond with Gd and the 0.5 wt.% Zn addition greatly reduces the coordination number (CN) of Gd atoms, forming an enhanced double solid-solution strengthening. Whereas, 1 wt.% Zn not only increases the CNs of Zn and Gd but also promotes the formation of minor Mg3Zn3Gd2 phase. Compared with the grain refinement strengthening, it is found that the solid solution strengthening is not a dominant factor.

Publication Date


  • 2021

Citation


  • Zong, J. J., Zhao, J., Wang, X. D., An, P. F., Zhang, J., Hu, T. D., . . . Jiang, J. Z. (2021). Local atomic structures of Gd and Zn atoms in extruded Mg-Gd-Zn alloys. Scripta Materialia, 195. doi:10.1016/j.scriptamat.2020.113720

Scopus Eid


  • 2-s2.0-85099198249

Web Of Science Accession Number


Volume


  • 195

Abstract


  • Minor addition of Gd and Zn can significantly improve the mechanical properties of extruded Mg-1 wt.%Gd-xZn (x = 0, 0.5, 1 wt.%) alloys. However, how they modify the structure of alloys remains elusive. By using x-ray absorption fine structure, we found that Zn atoms tend to bond with Gd and the 0.5 wt.% Zn addition greatly reduces the coordination number (CN) of Gd atoms, forming an enhanced double solid-solution strengthening. Whereas, 1 wt.% Zn not only increases the CNs of Zn and Gd but also promotes the formation of minor Mg3Zn3Gd2 phase. Compared with the grain refinement strengthening, it is found that the solid solution strengthening is not a dominant factor.

Publication Date


  • 2021

Citation


  • Zong, J. J., Zhao, J., Wang, X. D., An, P. F., Zhang, J., Hu, T. D., . . . Jiang, J. Z. (2021). Local atomic structures of Gd and Zn atoms in extruded Mg-Gd-Zn alloys. Scripta Materialia, 195. doi:10.1016/j.scriptamat.2020.113720

Scopus Eid


  • 2-s2.0-85099198249

Web Of Science Accession Number


Volume


  • 195