Phase stability and microstructures of high entropy alloys ion irradiated to high doses
- Univ. of Science and Technology Beijing (China)
- National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
- Peking Univ., Beijing (China)
- Univ. of Tennessee, Knoxville, TN (United States)
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 B2 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
- Research Organization:
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 51471025; B07003; FE-0004000; CMMI-1100080; W911NF-13-1-0438
- OSTI ID:
- 1482339
- Alternate ID(s):
- OSTI ID: 1460117
- Journal Information:
- Journal of Nuclear Materials, Vol. 480, Issue C; ISSN 0022-3115
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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