Journal
SCIENCE ADVANCES
Volume 6, Issue 37, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaz4748
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Funding
- U.S. Army Office Project [W911NF-13-1-0438, W911NF-19-2-0049]
- NSF [ACI-1548562, DMR-1611180, 1809640]
- Center of Materials Processing
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- Ministry of Science and Technology (MOST) of Taiwan [MOST-109-2636-M-009-002]
- Center for the Semiconductor Technology Researchfrom 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]
- U.S. Department of Energy's Fossil Energy Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) under the RSS [89243318CFE000003]
- 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]
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Department of Energy, National Energy Technology Laboratory, an agency of the U.S. Government
- Leidos Research Support Team (LRST)
- Tennessee Higher Education Commission (THEC) Center of Excellence
- National Research Foundation of Korea [4299990514684, 2020R1C1C1005553] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic and plastic deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures using integrated experimental efforts and theoretical calculations. The in situ neutron diffraction results reveal a temperature-dependent elastic anisotropic deformation behavior. The single-crystal elastic moduli and macroscopic Young's, shear, and bulk moduli were determined from the in situ neutron diffraction, showing great agreement with first-principles calculations, machine learning, and resonant ultrasound spectroscopy results. Furthermore, the edge dislocation-dominant plastic deformation behaviors, which are different from conventional BCC alloys, were quantitatively described by the Williamson-Hall plot profile modeling and high-angle annular dark-field scanning transmission electron microscopy.
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