Research Progress on Irradiation Effects and Mechanical Properties of Metal/High-Entropy Alloy Nanostructured Multilayers

doi:10.11900/0412.1961.2022.00113

Acta Metall Sin

2022, Vol. 58

Issue (11): 1371-1384 DOI: 10.11900/0412.1961.2022.00113

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Research Progress on Irradiation Effects and Mechanical Properties of Metal/High-Entropy Alloy Nanostructured Multilayers

ZHANG Jinyu(

), QU Qimeng, WANG Yaqiang, WU Kai, LIU Gang, SUN Jun

State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

Cite this article:

ZHANG Jinyu, QU Qimeng, WANG Yaqiang, WU Kai, LIU Gang, SUN Jun. Research Progress on Irradiation Effects and Mechanical Properties of Metal/High-Entropy Alloy Nanostructured Multilayers. Acta Metall Sin, 2022, 58(11): 1371-1384.

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Abstract

Key components in nuclear engineering serve as a security barrier, ensuring the smooth development of nuclear power technology, as well as safe and efficient operation of the nuclear power system in China. Metallic multilayers are novel nanostructured materials based on interface self-healing theory, which exhibit broad nuclear application due to their high-density heterogeneous interfaces. They can not only effectively hinder dislocation movement to enhance material strength but also obviously absorb irradiation-induced defects and promote their annihilation or recombination to improve material irradiation damage tolerance. Considering the recent domestic and international studies on irradiation characteristics of metal/high-entropy alloy multilayers, this study reviewed the evolution of microstructure and mechanical properties, and their underlying mechanisms in metal/high-entropy alloy multilayers before and after irradiation. Furthermore, it also explored strategies to enhance multilayers irradiation tolerance. The development of nanostructured multilayered materials with high tolerance to radiation damage were also proposed.

Key words: metal/high-entropy alloy multilayer mechanical property deformation mechanism irradiation defect evolution

Received: 11 March 2022

ZTFLH:

TG113

Fund: National Natural Science Foundation of China(92163201);National Natural Science Foundation of China(U2067219);National Natural Science Foundation of China(52001247);China Postdoctoral Science Foundation(2019M663689);Initiative Postdocs Supporting Program(BX20190266);Scientific Research Program of Youth Innovation Team(22JP042)

About author: ZHANG Jinyu, professor, Tel: 13484477818, E-mail: jinyuzhang1002@mail.xjtu.edu.cn

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	Jinyu ZHANG
	Qimeng QU
	Yaqiang WANG
	Kai WU
	Gang LIU
	Jun SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00113 OR https://www.ams.org.cn/EN/Y2022/V58/I11/1371

Fig.1 Microstructures and element distributions of Ni/FeCoCrNi multilayers with component layer thicknesses (h) of 10 (a, b)^[27] and 25 nm (c, d)^[27], and Cu/NbMoTaW multilayers with h of 10 nm (e, f)^[28] (STEM—scanning transmission electron microscope, HRTEM—high resolution transmission electron microscope, XTEM—X-ray transmission electron microscope, EDX—energy dispersive X-ray spectroscopy, HEA—high-entropy alloy, FFT—fast Fourier transform. The corresponding SAED patterns inserted in Figs.1a, c, and e exhibit different textures of different multilayers)
(a) typical STEM image, showing a clearly lamellar structure
(b) HRTEM image, showing the coherent interfaces and the morphology of penetrated twins
(c) typical XTEM image, showing clearly nanolayered structure
(d) corresponding EDX mapping analyses of square area in Fig.1c
(e) representative cross-sectional TEM images, showing clearly modulated structure
(f) typical HRTEM images (Inset is the corresponding FFT of boxed region, showing the amorphous-like microstructure of the HEA layers)

Fig.2 Indentation hardness as a function of h^-1/2 of Cu/FeCoCrNi (a)^[30] and Cu/NbMoTaW (b)^[42] multilayers as well as their bimetal multilayers siblings (IBS—interface barrier strength)

Fig.3 TEM images of deformed morphology in h = 50 nm Cu/FeCoCrNi multilayers^[30]
(a) STEM image of indentation region, showing uniform deformation
(b) TEM image of the highly deformed area of the box in Fig.3a and the corresponding SAED pattern (inset) (c, d) HRTEM images of the boxed areas in Fig.3b, displaying the corresponding FFT and IFFT, respectively (IFFT—inverse fast Fourier transform) (e) relationship between the plastic strain and number of layers of each constituent layer along the red solid line in Fig.3a

Fig.4 TEM images and statistical diagram of plastic strain of deformed morphology in h = 50 nm Cu/NbMoTaW multilayers^[28]
(a) cross-sectional TEM image of the indentation
(b) magnified view of the boxed area in Fig.4a for the shear band, showing the fracture of hard NbMoTaW layers
(c) HRTEM image of the interface of the boxed area in Fig.4b
(d) plastic strain of each constituent as a function of the number of layer along the red line in Fig.4a, indicating that the plastic deformation is dominated by soft Cu layers

Fig.5 Relationships between strain rate sensitivity index (m) and grain size (d) of fcc and bcc pure metals/high-entropy alloy films (HEAFs)^[50-66]

Fig.6 Relationships between m and h of Cu/NbMoTaW, Cu/FeCoCrNi, and Ni/FeCoCrNi multilayers^[27,28]

Fig.7 TEM image of irradiated h = 10 nm Cu/FeCoCrNi multilayers with the embedded He concentration profile (Inset shows the corresponding SAED pattern) (a), HRTEM image of the distribution of He bubbles in constituents indicated by white arrows and yellow dashed circles (b), and HRTEM image of nanolayered structure with coherent interfaces and nanotwins in the irradiated region (Insets show the corresponding FFTs, showing the twinning relationship) (c)^[78]

Fig.8 Variation of hardness (H) (a), irradiation hardening amount (ΔH) (b), and m (c) of Cu/FeCoCrNi nano-multilayers with h before and after irradiation (The dotted lines in Fig.8b are the fitting values of irradiation hardening at different stages near the critical layer thickness)^[78]

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