Metallurgical and Materials Transactions A

, Volume 49, Issue 5, pp 1931–1947 | Cite as

Deformation Behavior of Ultra-Strong and Ductile Mg-Gd-Y-Zn-Zr Alloy with Bimodal Microstructure

  • C. Xu
  • G. H. Fan
  • T. Nakata
  • X. Liang
  • Y. Q. Chi
  • X. G. Qiao
  • G. J. Cao
  • T. T. Zhang
  • M. Huang
  • K. S. Miao
  • M. Y. Zheng
  • S. Kamado
  • H. L. Xie


An ultra-strong and ductile Mg-8.2Gd-3.8Y-1Zn-0.4Zr (wt pct) alloy was developed by using hot extrusion to modify the microstructure via forced-air cooling and an artificial aging treatment. A superior strength–ductility balance was obtained that had a tensile yield strength of 466 MPa and an elongation to failure of 14.5 pct. The local strain evolution during the in situ testing of the ultra-strong and ductile alloy was quantitatively analyzed with high-resolution electron backscattered diffraction and digital image correlation. The fracture behavior during the tensile test was characterized by synchrotron X-ray tomography along with SEM and STEM observations. The alloy showed a bimodal microstructure, consisting of dynamically recrystallized (DRXed) grains with random orientations and elongated hot-worked grains with \( \left\langle { 10{\bar{\text{1}}}0} \right\rangle \) parallel to the extrusion direction. The DRXed grains were deformed by the basal 〈a〉 slip and the hot-worked grains were deformed by the prismatic 〈a〉 slip dominantly. The strain evolution analysis indicated that the multilayered structure relaxed the strain localization via strain transfer from the DRXed to the hot-worked regions, which led to the high ductility of the alloy. Precipitation of the γ′ on basal planes and the β′ phases on the prismatic planes of the α-Mg generated closed volumes, which enhanced the strength by pinning dislocations effectively, and contributed to the high ductility by impeding the propagation of micro-cracks inside the grains. The deformation incompatibility between the hot-worked grains and the arched block-shaped long-period stacking ordered (LPSO) phases induced the crack initiation and propagation, which fractured the alloy.



This work is supported by National Key Research and Development Program of China, 2016YFB0301102, JSPS Grant-in-Aid for Young Scientists (B), 16K18266, National Nature Science Foundation of China, 51571068, JST Advanced Low Carbon Technology Research and Development Program (ALCA), 12102886.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • C. Xu
    • 1
    • 2
  • G. H. Fan
    • 1
  • T. Nakata
    • 2
  • X. Liang
    • 3
  • Y. Q. Chi
    • 1
  • X. G. Qiao
    • 1
  • G. J. Cao
    • 1
  • T. T. Zhang
    • 1
  • M. Huang
    • 1
  • K. S. Miao
    • 1
  • M. Y. Zheng
    • 1
  • S. Kamado
    • 2
  • H. L. Xie
    • 4
  1. 1.School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinP.R. China
  2. 2.Research Center for Advanced Magnesium TechnologyNagaoka University of TechnologyNagaokaJapan
  3. 3.Institute of MaterialsShanghai UniversityShanghaiP.R. China
  4. 4.Shanghai Synchrotron Radiation FacilityShanghaiP.R. China

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