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

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 Wang, Suihe Jiang and Zhaoping Lu ()
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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

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-36319-0

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