Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide

被引：15

作者：

Jiang, Weilin ^{[1
]}

Jung, Hee Joon ^{[1
]}

Kovarik, Libor ^{[1
]}

Wang, Zhaoying ^{[1
]}

Roosendaal, Timothy J. ^{[1
]}

Zhu, Zihua ^{[1
]}

Edwards, Danny J. ^{[1
]}

Hu, Shenyang ^{[1
]}

Henager, Charles H., Jr. ^{[1
]}

Kurtz, Richard J. ^{[1
]}

Wang, Yongqiang ^{[2
]}

机构：

[1] Pacif Northwest Natl Lab, Richland, WA 99354 USA

[2] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 458卷

关键词：

STACKING-FAULT TETRAHEDRA; HIGH-TEMPERATURES; CRYSTAL-STRUCTURE; RADIATION-DAMAGE; FCC METALS; IRRADIATION; DIFFUSION; CU; EVOLUTION; ISSUES;

D O I：

10.1016/j.jnucmat.2014.12.071

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As a candidate material for fusion reactor applications, silicon carbide (SiC) undergoes transmutation reactions under high-energy neutron irradiation with magnesium as the major metallic transmutant; the others include aluminum, beryllium and phosphorus in addition to helium and hydrogen gaseous species. The impact of these transmutants on SiC structural stability is currently unknown. This study uses ion implantation to introduce Mg into SiC. Multiaxial ion-channeling analysis of the as-produced damage state indicates a lower dechanneling yield observed along the < 100 > axis. The microstructure of the annealed sample was examined using high-resolution scanning transmission electron microscopy. The results show a high concentration of likely non-faulted tetrahedral voids and possible stacking fault tetrahedra near the damage peak. In addition to lattice distortion, dislocations and intrinsic and extrinsic stacking faults are also observed. Magnesium in 3C-SiC prefers to substitute for Si and it forms precipitates of cubic Mg2Si and tetragonal MgC2. The diffusion coefficient of Mg in 3C-SiC single crystal at 1573 K has been determined to be 3.8 +/- 0.4 x 10(-19) m(2)/s. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：146 / 155

页数：10

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