Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy

被引：34

作者：

Agarwal, S. ^{[1
]}

Chen, Q. ^{[1
]}

Koyanagi, T. ^{[2
]}

Zhao, Y. ^{[3
]}

Zinkle, S. J. ^{[1
,2
,3
]}

Weber, W. J. ^{[2
,3
]}

机构：

[1] Univ Tennessee, Dept Nucl Engn, 406 Engn & Sci Annex,1412 Circle Dr, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, POB 2009, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2019年 / 526卷

关键词：

Irradiation damage; Carbon loss; Structural disorder; SiC/SiC composites; Raman spectroscopy;

D O I：

10.1016/j.jnucmat.2019.151778

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Incorporating Raman spectroscopy with transverse lift-out specimens is demonstrated to effectively characterize depth-dependent ion-irradiation damage in nuclear ceramics, such as SiC/SiC composites irradiated up to 1, 10 and 50 displacements per atom (dpa) at 350 degrees C using 10 MeV Au ions. Raman spectroscopy reveals irradiation-induced structural disorder saturation in both SiC-fiber and SiC-matrix at doses as low as 1 dpa, despite vastly different microstructures, inferred from similar longitudinal optical (LO) and transverse optical (TO) phonon peak shifts. Diamond (D) and graphitic (G) peaks from SiC-fibers disappear under irradiation, revealing irradiation-induced carbon packet loss. The irradiation-induced carbon packet loss is also verified by conducting TEM on same FIB foils used for Raman spectroscopy. In a previous study, the irradiation-induced SiC-fiber shrinkage is known to occur due to carbon packet loss in fibers. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：8

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