Structural damage and phase stability of Al0.3CoCrFeNi high entropy alloy under high temperature ion irradiation

Yang, Tengfei; Guo, Wei; Poplawsky, Jonathan D.; Li, Dongyue; Wang, Ling; Li, Yao; Hu, Wangyu; Crespillo, Miguel L.; Yan, Zhanfeng; Zhang, Yong; Wang, Yugang; Zinkle, Steven J.

doi:10.1016/j.actamat.2020.01.060

Structural damage and phase stability of Al_0.3CoCrFeNi high entropy alloy under high temperature ion irradiation

Journal Article · Wed Apr 01 00:00:00 EDT 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.01.060· OSTI ID:1648949

Yang, Tengfei ^[1]; ^[2]; ^[2]; Li, Dongyue ^[3]; ^[4]; Li, Yao ^[5]; Hu, Wangyu ^[6]; Crespillo, Miguel L. ^[4]; Yan, Zhanfeng ^[7]; ^[3]; Wang, Yugang ^[7]; ^[8]

Hunan Univ., Changsha (China). College of Materials Science and Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science & Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Hunan Univ., Changsha (China). College of Materials Science and Engineering
Peking Univ., Beijing (China). Center for Applied Physics and Technology, State Key Lab. of Nuclear Physics
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science & Engineering

In this study, an initially single phase high entropy alloy (HEA) Al_0.3CoCrFeNi was irradiated by 3 MeV Au ions to a fluence of 6 × 10¹⁵ cm^–2 (~31 dpa at damage peak) at four different temperatures ranging from 250 °C to 650 °C. Transmission electron microscopy (TEM) and Atom probe tomography (APT) were employed to study the evolution of structural damage and phase stability with irradiation temperature. Al_0.3CoCrFeNi exhibited a similar evolution of irradiation-induced defects with temperature as compared with conventional FCC alloys. At 250 °C and 350 °C, most of the visible irradiation-induced defects were faulted 1/3$$\langle{111}\rangle$$ dislocation loops. As the irradiation temperature increased to 500 °C, perfect 1/2$$\langle{110}\rangle$$ dislocation loops were observed along with the faulted loops. At the highest irradiation temperature 650 °C, only dislocation lines and networks could be observed. Regarding phase stability, the 3 MeV Au irradiation was observed to suppress the precipitation of (Ni, Al)-enriched nano clusters and the L12 ordered structure at irradiation temperatures 250 °C to 500 °C whereas precipitation of the B2 ordered structure was accelerated at 650 °C. This resulted in qualitatively opposite precipitation behavior between the ion irradiated damage region and unirradiated region at 500 °C and 650 °C. The opposite phase stability of the ion-irradiated damage region and unirradiated region at different temperatures is attributed to the competing effects of ballistic dissolution vs irradiation enhanced diffusion on precipitation.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Magnetic Confinement Fusion Energy Research Project; National Natural Science Foundation of China (NNSFC)

Grant/Contract Number:: AC05-00OR22725; SC0006661

OSTI ID:: 1648949

Alternate ID(s):: OSTI ID: 1779317

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 188; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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