Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 480, Issue -, Pages 100-108Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2016.08.017
Keywords
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Funding
- National Science Foundation of China [51471025]
- 111 Project [B07003]
- Cross-Cutting Technologies Program of National Energy Technology Laboratory under the RES [DE-FE-0004000]
- US National Science Foundation [CMMI-1100080]
- US Army Research Office [W911NF-13-1-0438]
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The microstructures of AlxCoCrFeNi (x = 0.1, 0.75 and 1.5 in molar ratio) high entropy alloys (HEAs) irradiated at room temperature with 3 MeV Au ions at the highest fluence of 105, 91, and 81 displacement per atom, respectively, were studied. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses show that the initial microstructures and phase composition of all three alloys are retained after ion irradiation and no phase decomposition is observed. Furthermore, it is demonstrated that the disordered face-centered cubic (FCC) and disordered body-centered cubic (BCC) phases show much less defect cluster formation and structural damage than the NiAl-type ordered B-2 phase. This effect is explained by higher entropy of mixing, higher defect formation/migration energies, substantially lower thermal conductivity, and higher atomic level stress in the disordered phases. (c) 2016 Elsevier B.V. All rights reserved.
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