Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 831, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142290
Keywords
Refractory high entropy alloy; B2 precipitate; High-temperature performance; Specific yield strength; Deformation behavior
Categories
Funding
- National Key Research and Development Program [2018YFB0703402]
- Chinese Academy of Sciences [ZDBS-LY-JSC023]
- Liao Ning Revitalization Talents Program [XLYC1802078, XLYC1807062]
- Liaoning Key Research and Development Program [2020JH2/10100013]
- Youth Innovation Promotion Association CAS [2021188]
- Science and Technology on Transient Impact Laboratory [6142606192208]
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A low-density ductile refractory high entropy alloy with excellent high-temperature properties has been developed, showing different deformation behaviors at 1073K and 1273K. This research not only reports a promising RHEA, but also contributes to the advancement of high-temperature structural materials.
Refractory high entropy alloys (RHEAs) with good high-temperature softening resistance have been revealed as promising candidates for high-temperature structural materials. In this work, a low-density ductile RHEA, Nb40Ti25Al15V10Ta5Hf3W2, has been developed. The RHEA with a BCC matrix and B2 nanoprecipitates exhibits excellent specific yield strength. The compressive specific yield strength (sigma(0.2)/rho) at 1073 K is as high as 83.2 MPa g(-1) cm(3). The different deformation behaviors during compression at 1073 K and 1273 K are also identified. The dislocation-dominated deformation provides the initial strain hardening capability, and then microcracks and dynamic recovery accelerate the transition from strain hardening to softening at 1073 K. While the diffusion-controlled dislocation annihilation and continuous dynamic recrystallization (DRX) are the dominant reasons for persistent strain softening at 1273 K. Our work not only reports a promising RHEA with excellent high-temperature properties, but also promotes the development of RHEAs for high-temperature applications.
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