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A ductile Nb40Ti25Al15V10Ta5Hf3W2 refractory high entropy alloy with high specific strength for high-temperature applications.
- Source :
-
Materials Science & Engineering: A . Jan2022, Vol. 831, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- 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, Nb 40 Ti 25 Al 15 V 10 Ta 5 Hf 3 W 2 , has been developed. The RHEA with a BCC matrix and B2 nanoprecipitates exhibits excellent specific yield strength. The compressive specific yield strength (σ 0.2 /ρ) at 1073 K is as high as 83.2 MPa g−1 cm3. 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. • A low-density ductile RHEA, Nb 40 Ti 25 Al 15 V 10 Ta 5 Hf 3 W 2 , has been developed. • The RHEA has BCC matrix and B2 nanoprecipitates. • The RHEA possesses the superior SYS (σ 0.2 /ρ = 83.2 MPa g−1 cm3) at 1073 K. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STRAIN hardening
*CONSTRUCTION materials
*ENTROPY
*ALLOYS
*REFRACTORY materials
Subjects
Details
- Language :
- English
- ISSN :
- 09215093
- Volume :
- 831
- Database :
- Academic Search Index
- Journal :
- Materials Science & Engineering: A
- Publication Type :
- Academic Journal
- Accession number :
- 153852830
- Full Text :
- https://doi.org/10.1016/j.msea.2021.142290