期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 604, 期 -, 页码 331-339出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.03.050
关键词
High-entropy alloy; Dynamical mechanical property; Damping behavior; Modulus
资金
- National Natural Science Foundation of China [51101110, 51371122, 11390362]
- Shanxi Scholarship Council of China [2012-032]
- US National Science Foundation [DMR-0909037, CMMI-0900271, CMMI-1100080]
- Department of Energy Office of Nuclear Energy's University Programs (NEUP) [00119262]
- Innovative Processing and Technologies Program of the National Energy Technology Laboratory's (NETL) Strategic Center for Coal under the RES contract [DE-FE-0004000]
- Top Young Academic Leaders of Shanxi
- Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0909037] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1100080, 0900271] Funding Source: National Science Foundation
For the first time, the damping behavior of high-entropy alloys was studied using the dynamic-mechanical analyzer, over a continuous heating temperature from room temperature to 773 K, at a given frequency range from 1 to 16 Hz in model alloys AlxCoCrFeNi (x = 0, 0.25, 0.5, 0.75, and 1). The experimental results reveal that the Al-rich alloys have a much smaller elastic storage- modulus amplitude over the temperature and thus a larger resistance to structural relaxation, while the Al-free and Al-lean alloys exhibit a much higher loss tangent and thus a much higher damping capability. Overall the elastic storage modulus decreases while the loss tangent increases with increasing the temperature, but little dependence was observed for the frequency. Several visible internal-friction peaks were presented in the face-centered cubic alloys, whose positions and heights are independent of the frequency. The damping capability of these alloys can be comparable to or even overwhelm the conventional Fe-Al alloys. The damping behavior above was proposed to be agreeable with the level of ordering (eta) of alloys characterized by two proposed parameters (the relative-entropy effect, Omega, and the atomic-size difference, delta). (C) 2014 Elsevier B.V. All rights reserved.
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