Enhancing fatigue life by ductile-transformable multicomponent B2 precipitates in a high-entropy alloy
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 11, 2021
- Source ID
- 10.1038/s41467-021-23689-6
Entities
People
- Chuhao Liu
- Dunji Yu
- Huamiao Wang
- Ke An
- Maryam Ghazisaeidi
- Peter K Liaw
- Rui Feng
- T. Ungár
- Xie Xie
- Yan Chen
- You Rao
Organizations
- Army Research Office
- National Science Foundation