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Manipulating the ordered oxygen complexes to achieve high strength and ductility in medium-entropy alloys

Author

Listed:
  • Meiyuan Jiao

    (University of Science and Technology Beijing)

  • Zhifeng Lei

    (Hunan University)

  • Yuan Wu

    (University of Science and Technology Beijing)

  • Jinlong Du

    (Peking University)

  • Xiao-Ye Zhou

    (Shenzhen University)

  • Wenyue Li

    (University of Science and Technology Beijing)

  • Xiaoyuan Yuan

    (University of Science and Technology Beijing)

  • Xiaochun Liu

    (Changsha University of Science & Technology)

  • Xiangyu Zhu

    (The University of Texas at Dallas)

  • Shudao Wang

    (University of Science and Technology Beijing)

  • Huihui Zhu

    (University of Science and Technology Beijing)

  • Peipei Cao

    (University of Science and Technology Beijing)

  • Xiongjun Liu

    (University of Science and Technology Beijing)

  • Xiaobin Zhang

    (University of Science and Technology Beijing)

  • Hui Wang

    (University of Science and Technology Beijing)

  • Suihe Jiang

    (University of Science and Technology Beijing)

  • Zhaoping Lu

    (University of Science and Technology Beijing)

Abstract

Oxygen solute strengthening is an effective strategy to harden alloys, yet, it often deteriorates the ductility. Ordered oxygen complexes (OOCs), a state between random interstitials and oxides, can simultaneously enhance strength and ductility in high-entropy alloys. However, whether this particular strengthening mechanism holds in other alloys and how these OOCs are tailored remain unclear. Herein, we demonstrate that OOCs can be obtained in bcc (body-centered-cubic) Ti-Zr-Nb medium-entropy alloys via adjusting the content of Nb and oxygen. Decreasing the phase stability enhances the degree of (Ti, Zr)-rich chemical short-range orderings, and then favors formation of OOCs after doping oxygen. Moreover, the number density of OOCs increases with oxygen contents in a given alloy, but adding excessive oxygen (>3.0 at.%) causes grain boundary segregation. Consequently, the tensile yield strength is enhanced by ~75% and ductility is substantially improved by ~164% with addition of 3.0 at.% O in the Ti-30Zr-14Nb MEA.

Suggested Citation

  • Meiyuan Jiao & Zhifeng Lei & Yuan Wu & Jinlong Du & Xiao-Ye Zhou & Wenyue Li & Xiaoyuan Yuan & Xiaochun Liu & Xiangyu Zhu & Shudao Wang & Huihui Zhu & Peipei Cao & Xiongjun Liu & Xiaobin Zhang & Hui W, 2023. "Manipulating the ordered oxygen complexes to achieve high strength and ductility in medium-entropy alloys," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36319-0
    DOI: 10.1038/s41467-023-36319-0
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    References listed on IDEAS

    as
    1. Zhifeng Lei & Xiongjun Liu & Yuan Wu & Hui Wang & Suihe Jiang & Shudao Wang & Xidong Hui & Yidong Wu & Baptiste Gault & Paraskevas Kontis & Dierk Raabe & Lin Gu & Qinghua Zhang & Houwen Chen & Hongtao, 2018. "Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes," Nature, Nature, vol. 563(7732), pages 546-550, November.
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