首页|Tuning deformation mechanisms of face-centered-cubic high-entropy alloys via boron doping

Tuning deformation mechanisms of face-centered-cubic high-entropy alloys via boron doping

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  • NSTL
  • Elsevier
? 2022 Elsevier B.V.Face-centered-cubic (FCC) high-entropy alloys (HEAs) can be strengthened through boron doping. However, the existing form of boron and its effect on the deformation mechanism of FCC HEAs have been rarely reported. The present work demonstrates for the first time the effect of the interstitial boron and boron-rich precipitate on the deformation mechanisms of the FCC (CoCrFeNi) HEAs. The dominant deformation mechanism of CoCrFeNi HEAs is dislocation slip, whereas the interstitial boron atoms dissolved in the matrix, thereby reducing the stacking fault energy (SFE) and transforming the dominant deformation mechanism to deformation twins. The loss of Cr from the matrix after boride formation increased the SFE, which led to transforming the dominant deformation mechanism from deformation twins to dislocation slip. Based on the results, we firstly propose to tune the deformation mechanism of FCC HEAs via boron doping, which provide a new strategy for designing and optimizing the HEAs.

Boron dopingDeformation mechanismDislocationHigh entropy alloysMechanical properties

Zhang H.、Wang C.、Shi S.、Li T.、Zou L.、Lu Y.、Liaw P.K.

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Engineering Research Center of High entropy Alloy Materials (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology

Department of Materials Science and Engineering The University of Tennessee

2022

10.1016/j.jallcom.2022.165103

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
年,卷(期)：2022.911
  • 14
  • 44