He bubbles inhibition and abnormal hardening in GH3535 alloy by niobium element addition

被引：2

作者：

Liu, Chengpeng ^{[1
]}

Ye, Xiang-Xi ^{[1
]}

Zhu, Zhenbo ^{[1
]}

Huang, Shasha ^{[2
]}

Zhao, Shijun ^{[2
]}

Lei, Guanhong ^{[1
]}

Ge, Lin ^{[3
]}

Zhang, Xiaona ^{[3
]}

Leng, Bin ^{[1
]}

Huang, Hefei ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Appl Phys, 2019 Jialuo Rd, Shanghai 201800, Peoples R China

[2] City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China

[3] Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Fac Mat & Mfg, Beijing 100124, Peoples R China

来源：

JOURNAL OF NUCLEAR MATERIALS | 2024年 / 589卷

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Nickel -based alloy; He ion irradiation; Nb element; He bubble; Superlattice phase; GENERALIZED GRADIENT APPROXIMATION; TOTAL-ENERGY CALCULATIONS; DO22; SUPERLATTICE; ION-IRRADIATION; DIFFUSION; MICROSTRUCTURE; INTERSTITIALS; TEMPERATURE; EVOLUTION; NICKEL;

D O I：

10.1016/j.jnucmat.2023.154841

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

GH3535 and 2 wt.% Nb-modified GH3535 (Nb-GH3535) alloys were irradiated with 1.2 MeV He ion at fluences of 1 x 1016, 3 x 1016 and 1 x 1017 ions/cm2 at 750 degrees C. Microstructural changes, including the formation of He bubbles and superlattice phases, as well as the irradiation-induced hardening, were investigated by TEM and nanoindentation. Notably, Nb-GH3535 exhibited a smaller size and lower number density of He bubbles, especially at higher fluences, indicating the inhibitory effect of Nb on bubble evolution. First-principles calculations revealed that the presence of Nb inhibits the combination of He atoms and vacancies, reducing their diffusion rate and consequently impeding the nucleation and growth of He bubbles. Furthermore, the addition of Nb facilitates the irradiation-induced precipitation of the superlattice phase, leading to a higher degree of total hardening in Nb-GH3535 alloy.

引用

页数：12

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