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

Xia, Songqin; Gao, Michael C.; Yang, Tengfei; Liaw, Peter K.; Zhang, Yong

doi:10.1016/j.jnucmat.2016.08.017

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

Journal Article · Thu Aug 18 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.08.017· OSTI ID:1482339

Xia, Songqin ^[1]; Gao, Michael C. ^[2]; Yang, Tengfei ^[3]; Liaw, Peter K. ^[4]; ^[1]

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 Al_xCoCrFeNi (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

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Lab. (NETL), Albany, OR (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1482339

Alternate ID(s):: OSTI ID: 22644412
OSTI ID: 1460117

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 480; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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