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题名: Influence of helium atoms on the shear behavior of the fiber/matrix interphase of SiC/SiC composite
作者: Jin, Enze1;  Du, Shiyu2;  Li, Mian2;  Liu, Chen3;  He, Shihong1, 2;  He, Jian4;  He, Heming1
刊名: JOURNAL OF NUCLEAR MATERIALS
发表日期: 2016-10-01
DOI: 10.1016/j.jnucmat.2016.07.041
卷: 479, 页:504-514
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Materials Science, Multidisciplinary ;  Nuclear Science & Technology ;  Mining & Mineral Processing
英文摘要: Silicon carbide has many attractive properties and the SiC/SiC composite has been considered as a promising candidate for nuclear structural materials. Up to now, a computational investigation on the properties of SiC/SiC composite varying in the presence of nuclear fission products is still missing. In this work, the influence of He atoms on the shear behavior of the SiC/SiC interphase is investigated via Molecular Dynamics simulation following our recent paper. Calculations are carried out on three dimensional models of graphite-like PyC/SiC interphase and amorphous PyC/SiC interphase with He atoms in different regions (the SiC region, the interface region and the PyC region). In the graphite-like PyC/SiC interphase, He atoms in the SiC region have little influence on the shear strength of the material, while both the shear strength and friction strength may be enhanced when they are in the PyC region. Low concentration of He atoms in the interface region of the graphite-like PyC/SiC interphase increases the shear strength, while there is a reduction of shear strength when the He concentration is high due to the switch of sliding plane. In the amorphous PyC/SiC interphase, He atoms can cause the reduction of the shear strength regardless of the regions that He atoms are located. The presence of He atoms may significantly alter the structure of SiC/SiC in the interface region. The influence of He atoms in the interface region is the most significant, leading to evident shear strength reduction of the amorphous PyC/SiC interphase with increasing He concentration. The behaviors of the interphases at different temperatures are studied as well. The dependence of the shear strengths of the two types of interphases on temperatures is studied as well. For the graphite-like PyC/SiC interphase, it is found strongly related to the regions He atoms are located. Combining these results with our previous study on pure SiC/SiC system, we expect this work may provide new insight into the mechanism of interphase evolution when SiC/SiC is applied as nuclear materials. (C) 2016 Elsevier B. V. All rights reserved.
关键词[WOS]: SILICON-CARBIDE COMPOSITES ;  STRUCTURAL-PROPERTIES ;  SICF/SIC COMPOSITES ;  NEUTRON-IRRADIATION ;  MOLECULAR-DYNAMICS ;  1ST PRINCIPLES ;  PERFORMANCE ;  MODELS ;  FIBER
语种: 英语
WOS记录号: WOS:000383552200061
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150360
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.State Nucl Power Res Inst, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Engn Lab Specialty Fibers & Nucl Energy Mat, Ningbo 315201, Zhejiang, Peoples R China
3.Beijing Res Inst Chem Engn & Met, Beijing, Peoples R China
4.Chinese Acad Sci, Ctr Translat Med, Dalian Inst Chem Phys, Dept Biotechnol, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Jin, Enze,Du, Shiyu,Li, Mian,et al. Influence of helium atoms on the shear behavior of the fiber/matrix interphase of SiC/SiC composite[J]. JOURNAL OF NUCLEAR MATERIALS,2016,479:504-514.
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