期刊
ADVANCED MATERIALS
卷 32, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004029
关键词
alloy‐ design strategies; lattice distortion; microstructure; NbTaTiVZr; refractory high‐ entropy alloys; yield strength
类别
资金
- U.S. Army Office Project [W911NF-13-1-0438, W911NF-19-2-0049]
- National Science Foundation [ACI-1548562, DMR-1611180, 1809640, DMR-1945380]
- US Department of Energy's Fossil Energy Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) under the RSS [89243318CFE000003]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. DOE Office of Science User Facility [DE-AC02-05CH11231]
- Ministry of Science and Technology (MOST) of Taiwan [MOST-109-2636-M-009-002]
- Center for the Semiconductor Technology Research from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
- Ministry of Science and Technology, Taiwan [MOST 109-2634-F-009-029]
- Basic Research Laboratory Program through the Ministry of Education of the Republic of Korea [2019R1A4A1026125]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1C1C1005553]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Department of Energy, National Energy Technology Laboratory, an agency of the United States Government
- Leidos Research Support Team (LRST)
- National Research Foundation of Korea [2019R1A4A1026125, 2020R1C1C1005553, 4299990514684] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Severe distortion is one of the four core effects in single-phase high-entropy alloys (HEAs) and contributes significantly to the yield strength. However, the connection between the atomic-scale lattice distortion and macro-scale mechanical properties through experimental verification has yet to be fully achieved, owing to two critical challenges: 1) the difficulty in the development of homogeneous single-phase solid-solution HEAs and 2) the ambiguity in describing the lattice distortion and related measurements and calculations. A single-phase body-centered-cubic (BCC) refractory HEA, NbTaTiVZr, using thermodynamic modeling coupled with experimental verifications, is developed. Compared to the previously developed single-phase NbTaTiV HEA, the NbTaTiVZr HEA shows a higher yield strength and comparable plasticity. The increase in yield strength is systematically and quantitatively studied in terms of lattice distortion using a theoretical model, first-principles calculations, synchrotron X-ray/neutron diffraction, atom-probe tomography, and scanning transmission electron microscopy techniques. These results demonstrate that severe lattice distortion is a core factor for developing high strengths in refractory HEAs.
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