Enhancing fatigue life by ductile-transformable multicomponent B2 precipitates in a high-entropy alloy

Rui Feng, You Rao, Chuhao Liu, Xie Xie, Dunji Yu, Yan Chen, Maryam Ghazisaeidi, Tamas Ungar, Huamiao Wang, Ke An () and Peter. K. Liaw ()
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Rui Feng: The University of Tennessee
You Rao: The Ohio State University
Chuhao Liu: Shanghai Jiao Tong University
Xie Xie: The University of Tennessee
Dunji Yu: Oak Ridge National Laboratory
Yan Chen: Oak Ridge National Laboratory
Maryam Ghazisaeidi: The Ohio State University
Tamas Ungar: Eötvös University Budapest
Huamiao Wang: Shanghai Jiao Tong University
Ke An: Oak Ridge National Laboratory
Peter. K. Liaw: The University of Tennessee

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Catastrophic accidents caused by fatigue failures often occur in engineering structures. Thus, a fundamental understanding of cyclic-deformation and fatigue-failure mechanisms is critical for the development of fatigue-resistant structural materials. Here we report a high-entropy alloy with enhanced fatigue life by ductile-transformable multicomponent B2 precipitates. Its cyclic-deformation mechanisms are revealed by real-time in-situ neutron diffraction, transmission-electron microscopy, crystal-plasticity modeling, and Monte-Carlo simulations. Multiple cyclic-deformation mechanisms, including dislocation slips, precipitation strengthening, deformation twinning, and reversible martensitic phase transformation, are observed in the studied high-entropy alloy. Its improved fatigue performance at low strain amplitudes, i.e., the high fatigue-crack-initiation resistance, is attributed to the high elasticity, plastic deformability, and martensitic transformation of the B2-strengthening phase. This study shows that fatigue-resistant alloys can be developed by incorporating strengthening ductile-transformable multicomponent intermetallic phases.

Date: 2021
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DOI: 10.1038/s41467-021-23689-6

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