Neutron irradiation induced microstructural changes in NBG-18 and IG-110 nuclear graphites

被引：62

作者：

Karthik, Chinnathambi ^{[1
,2
]}

Kane, Joshua ^{[1
,2
,3
]}

Butt, Darryl P. ^{[1
,2
]}

Windes, William E. ^{[2
,3
]}

Ubic, Rick ^{[1
,2
]}

机构：

[1] Boise State Univ, Dept Mat Sci & Engn, Boise, ID 83725 USA

[2] Ctr Adv Energy Studies, Idaho Falls, ID 83415 USA

[3] Idaho Natl Lab, Idaho Falls, ID 83415 USA

来源：

CARBON | 2015年 / 86卷

关键词：

TRANSMISSION ELECTRON-MICROSCOPY; GRADE GRAPHITE; DAMAGE PROCESS; CARBON-FIBER; REACTOR;

D O I：

10.1016/j.carbon.2015.01.036

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper reports the neutron-irradiation-induced effects on the microstructure of NBG-18 and IG-110 nuclear graphites. The high-temperature neutron irradiation at two different irradiation conditions was carried out at the Advanced Test Reactor National User Facility at the Idaho National Laboratory. NBG-18 samples were irradiated to 1.54 dpa and 6.78 dpa at 430 degrees C and 678 degrees C respectively. samples were irradiated to 1.91 dpa and 6.70 dpa at 451 degrees C and 674 degrees C respectively. Bright-field transmission electron microscopy imaging was used to study the changes in different microstructural components such as filler particles, microcracks, binder and quinoline-insoluble (QI) particles. Significant changes have been observed in samples irradiated to about 6.7 dpa. The closing of pre-existing microcracks was observed in both the filler and the binder phases. The binder phase exhibited substantial densification with near complete elimination of the microcracks. The QI particles embedded in the binder phase exhibited a complete microstructural transformation from rosettes to highly crystalline solid spheres. The lattice images indicate the formation of edge dislocations as well as extended line defects bridging the adjacent basal planes. The positive climb of these dislocations has been identified as the main contributor to the irradiation-induced swelling of the graphite lattice. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：124 / 131

页数：8

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