The effect of stress state and He concentration on the dislocation loop evolution in Ni superalloy irradiated by Ni plus & He plus dual-beam ions: In-situ TEM observation and MD simulations

doi:10.1016/j.jmst.2024.06.015

IMR OpenIR

	The effect of stress state and He concentration on the dislocation loop evolution in Ni superalloy irradiated by Ni plus & He plus dual-beam ions: In-situ TEM observation and MD simulations
	Zhu, Zhenbo 1; Qiu, Rongyang 2; Chang, Litao 1; Ma, Guangcai 3; Deng, Huiqiu 2; Huang, Hefei 1
通讯作者	Deng, Huiqiu(hqdeng@hnu.edu.cn) ; Huang, Hefei(huanghefei@sinap.ac.cn)
	2025-03-20
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	212 页码:77-88
摘要	In-situ TEM observation was conducted during Ni+ &He+ dual-beam irradiation to monitor the evolution of dislocation loops accompanied by He bubbles in the Ni-based alloy GH3535. Two distinct evolutions of dislocation loops, driven by residual stresses, were observed within the monitored grains. Hence, molecular dynamics (MD) simulations were employed to reveal the effects of stress magnitude and direction on loop evolution, including size, number density, type and variation. The simulations revealed that the presence of compressive stress reduced the formation energy of perfect dislocation loops, thus promoting their formation. Stress state was found to influence the preferential orientation of the loops, and compressive stress resulted in a decreased number density of dislocation loops but an increase in their size. This establishes a clear relationship between stress state and magnitude and the evolution of dislocation loops during ion beam irradiation. Additionally, the nature and characteristics of dislocation loops were quantified to explore the effects of He concentrations on their evolution. The higher He concentration not only promotes the nucleation of dislocation loops, leading to their higher number density, but also facilitates the unfaulting evolution by increasing the stacking fault energy (SFE). Moreover, the accumulation of He in the lower-He-concentration sample led to the growth of dislocation loops in multiple stages, explaining their nearly identical average sizes when compared to the higher-He-concentration sample. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Nickel -based superalloy Dual -beam ion irradiation Helium bubbles Dislocation loops In -situ characterization MD simulation
资助者	National Natural Science Foundation of China ; Young Potential Program of Shanghai Institute of Applied Physics, Chinese Academy of Sciences ; National MCF Energy RD Program
DOI	10.1016/j.jmst.2024.06.015
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[U2341261] ; National Natural Science Foundation of China[12375280] ; Young Potential Program of Shanghai Institute of Applied Physics, Chinese Academy of Sciences[YXJH-2022002] ; National MCF Energy RD Program[2022YFE03110000]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001266158100001
出版者	JOURNAL MATER SCI TECHNOL
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/187921
专题	中国科学院金属研究所
通讯作者	Deng, Huiqiu; Huang, Hefei
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 2.Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Zhenbo,Qiu, Rongyang,Chang, Litao,et al. The effect of stress state and He concentration on the dislocation loop evolution in Ni superalloy irradiated by Ni plus & He plus dual-beam ions: In-situ TEM observation and MD simulations[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,212:77-88.
APA	Zhu, Zhenbo,Qiu, Rongyang,Chang, Litao,Ma, Guangcai,Deng, Huiqiu,&Huang, Hefei.(2025).The effect of stress state and He concentration on the dislocation loop evolution in Ni superalloy irradiated by Ni plus & He plus dual-beam ions: In-situ TEM observation and MD simulations.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,212,77-88.
MLA	Zhu, Zhenbo,et al."The effect of stress state and He concentration on the dislocation loop evolution in Ni superalloy irradiated by Ni plus & He plus dual-beam ions: In-situ TEM observation and MD simulations".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 212(2025):77-88.