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Title: Phase stability and microstructures of high entropy alloys ion irradiated to high doses

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. Univ. of Science and Technology Beijing (China)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  3. Peking Univ., Beijing (China)
  4. 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
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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Cited By (4)

Science and technology in high-entropy alloys journal January 2018
Configurational Entropy in Multicomponent Alloys: Matrix Formulation from Ab Initio Based Hamiltonian and Application to the FCC Cr-Fe-Mn-Ni System journal January 2019
A Novel Low-Activation VCrFeTaxWx (x = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance journal December 2018
Mechanical properties and thermal stability of (NbTiAlSiZr)N x high-entropy ceramic films at high temperatures journal October 2018

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