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

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

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

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

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

110 Scopus citations

Abstract

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〈111〉 dislocation loops. As the irradiation temperature increased to 500 °C, perfect 1/2〈110〉 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.

Original language	English
Pages (from-to)	1-15
Number of pages	15
Journal	Acta Materialia
Volume	188
DOIs	https://doi.org/10.1016/j.actamat.2020.01.060
State	Published - Apr 15 2020

Funding

This work was financially supported in part by the Office of Fusion Energy, US Department of Energy (grant # DE-SC0006661 with the University of Tennessee), the National Magnetic Confinement Fusion Energy Research Project 2015GB113000 and the National Natural Science Foundation of China (11905057, 11935004). YZ very much appreciates the financial support from the National Natural Science Foundation of China (Nos. 51671020), 111 Project (B07003), and the Program for Chang-jiang Scholars and the Innovative Research Team of the University. Atom probe tomography was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. This work was financially supported in part by the Office of Fusion Energy, US Department of Energy (grant # DE-SC0006661 with the University of Tennessee), the National Magnetic Confinement Fusion Energy Research Project 2015GB113000 and the National Natural Science Foundation of China (11905057, 11935004). YZ very much appreciates the financial support from the National Natural Science Foundation of China (Nos. 51671020), 111 Project (B07003), and the Program for Chang-jiang Scholars and the Innovative Research Team of the University. Atom probe tomography was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility.

Keywords

High entropy alloy
Irradiation effect
Phase stability
Structural damage

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10.1016/j.actamat.2020.01.060

Cite this

@article{da0a3695a54248a0b214ba869f0705f8,

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

abstract = "An initially single phase high entropy alloy (HEA) Al0.3CoCrFeNi 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. Al0.3CoCrFeNi 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〈111〉 dislocation loops. As the irradiation temperature increased to 500 °C, perfect 1/2〈110〉 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.",

keywords = "High entropy alloy, Irradiation effect, Phase stability, Structural damage",

author = "Tengfei Yang and Wei Guo and Poplawsky, {Jonathan D.} and Dongyue Li and Ling Wang and Yao Li and Wangyu Hu and Crespillo, {Miguel L.} and Zhanfeng Yan and Yong Zhang and Yugang Wang and Zinkle, {Steven J.}",

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year = "2020",

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doi = "10.1016/j.actamat.2020.01.060",

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T1 - Structural damage and phase stability of Al0.3CoCrFeNi high entropy alloy under high temperature ion irradiation

AU - Yang, Tengfei

AU - Guo, Wei

AU - Poplawsky, Jonathan D.

AU - Li, Dongyue

AU - Wang, Ling

AU - Li, Yao

AU - Hu, Wangyu

AU - Crespillo, Miguel L.

AU - Yan, Zhanfeng

AU - Zhang, Yong

AU - Wang, Yugang

AU - Zinkle, Steven J.

PY - 2020/4/15

Y1 - 2020/4/15

N2 - An initially single phase high entropy alloy (HEA) Al0.3CoCrFeNi 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. Al0.3CoCrFeNi 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〈111〉 dislocation loops. As the irradiation temperature increased to 500 °C, perfect 1/2〈110〉 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.

AB - An initially single phase high entropy alloy (HEA) Al0.3CoCrFeNi 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. Al0.3CoCrFeNi 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〈111〉 dislocation loops. As the irradiation temperature increased to 500 °C, perfect 1/2〈110〉 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.

KW - High entropy alloy

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