Effects of intragranular defects on helium accumulation damage in nanocrystalline nitrides

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	Effects of intragranular defects on helium accumulation damage in nanocrystalline nitrides
	Lao, YX; Niu, WX; Shi, YL; Du, H; Zhang, HB; Hu, SL; Wang, Y; Wang, Y (reprint author), Sichuan Univ, Inst Nucl Sci & Technol, Minist Educ, Key Lab Radiat Phys & Technol, Chengdu 610064, Sichuan, Peoples R China.; Hu, SL (reprint author), China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China.
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-03-30
卷号	739 页码:401-406
关键词	Microstructure Evolution Radiation Tolerance Bubble Formation He Irradiation Degrees-c Interfaces Migration Ceramics
ISSN号	0925-8388
英文摘要	Nanomaterials with a high density of interfaces, which absorb helium (He) atoms and suppress the expansion of He bubbles, can exhibit a superior neutron radiation tolerance. However, the intragranular defects formed under long-term radiation can interact strongly with the He atoms, which would bring more uncertainties to the reliability of materials served in neutron radiation environment. In this work, He atoms and intragranular defects were introduced uniformly into the nanocrystalline (NC) ZrN and TaN films for investigating the effects of the intragranular defects on the He accumulation damage in nanomaterials. The microstructure, lattice parameter and surface morphology of the NC nitrides were investigated systematically. The results showed that the He accumulation damage was very sensitive to the structure of intragranular defects in the He-implanted materials. The cross-grained stacking faults in the ZrN films may act as diffusion channels for the He atoms, facilitating the He accumulation at the grain boundaries, while the vacancy-type dislocation loops in the TaN films can act as small cracks trapping the He atoms, resulting in the formation and unstable expansion of the He platelets in the interior of the grains. (c) 2017 Elsevier B.V. All rights reserved.; Nanomaterials with a high density of interfaces, which absorb helium (He) atoms and suppress the expansion of He bubbles, can exhibit a superior neutron radiation tolerance. However, the intragranular defects formed under long-term radiation can interact strongly with the He atoms, which would bring more uncertainties to the reliability of materials served in neutron radiation environment. In this work, He atoms and intragranular defects were introduced uniformly into the nanocrystalline (NC) ZrN and TaN films for investigating the effects of the intragranular defects on the He accumulation damage in nanomaterials. The microstructure, lattice parameter and surface morphology of the NC nitrides were investigated systematically. The results showed that the He accumulation damage was very sensitive to the structure of intragranular defects in the He-implanted materials. The cross-grained stacking faults in the ZrN films may act as diffusion channels for the He atoms, facilitating the He accumulation at the grain boundaries, while the vacancy-type dislocation loops in the TaN films can act as small cracks trapping the He atoms, resulting in the formation and unstable expansion of the He platelets in the interior of the grains. (c) 2017 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [11505121, 11775150, 21503201]; International Science and Technology Cooperation Program of China [2014DFR50710]; National Key Research and Development Program of China [2016YFB0201203]; President foundation of China Academy of Engineering Physics [YZJJLX2016004]; Key Laboratory of Nuclear Materials and Safety Assessment [2017NMSAKF02]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79417]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Y (reprint author), Sichuan Univ, Inst Nucl Sci & Technol, Minist Educ, Key Lab Radiat Phys & Technol, Chengdu 610064, Sichuan, Peoples R China.; Hu, SL (reprint author), China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China.
推荐引用方式 GB/T 7714	Lao, YX,Niu, WX,Shi, YL,et al. Effects of intragranular defects on helium accumulation damage in nanocrystalline nitrides[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,739:401-406.
APA	Lao, YX.,Niu, WX.,Shi, YL.,Du, H.,Zhang, HB.,...&Hu, SL .(2018).Effects of intragranular defects on helium accumulation damage in nanocrystalline nitrides.JOURNAL OF ALLOYS AND COMPOUNDS,739,401-406.
MLA	Lao, YX,et al."Effects of intragranular defects on helium accumulation damage in nanocrystalline nitrides".JOURNAL OF ALLOYS AND COMPOUNDS 739(2018):401-406.