Effect of Carbon on Dislocation Loops Formation during Self-Ion Irradiation in Fe-Cr Alloys at High Temperatures

被引：2
|
作者：
Shi, Tiantian [1 ]
Liu, Wenbo [1 ]
Su, Zhengxiong [1 ]
Yan, Xu [1 ]
Lu, Chenyang [1 ]
Yun, Di [1 ]
机构：
[1] Xi An Jiao Tong Univ, Dept Nucl Sci & Technol, Xian 710049, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 06期
基金：
中国国家自然科学基金;
关键词：
dislocation loops; self-ion irradiation; Fe-Cr alloys; carbon; MICROSTRUCTURE EVOLUTION; NANOSTRUCTURE EVOLUTION; INTERSTITIAL CLUSTERS; COMPUTER-SIMULATION; MODEL ALLOYS; NEUTRON; CHROMIUM; VACANCY; PRECIPITATION; IRON;
D O I：
10.3390/ma15062211
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：
In this study, two types of ferritic model alloys (Fe-9Cr and Fe-9Cr-C) were simultaneously irradiated with 3.5 MeV Fe13+ ions at 450 degrees C and 550 degrees C to a dose of 3dpa at the peak damage region, respectively. Transmission electron microscopy (TEM) was used to investigate the microstructural evolution of the Fe-Cr alloys after irradiation. The experimental results showed that the size of the dislocation loops formed in the Fe-9Cr-C alloy was larger than that in the Fe-9Cr alloy, but the loop density of the Fe-9Cr-C alloy was lower than that of the Fe-9Cr alloy after irradiation at 450 degrees C. The reason for this phenomenon was attributed to the fact that loops formed in Fe-9Cr-C alloy have greater capture efficiency for interstitial atoms. Compared to Fe-Cr alloys irradiated at 450 degrees C, high-density loops were not observed in the Fe-Cr alloys irradiated at 550 degrees C; the number of dislocation loops in the Fe-Cr alloys irradiated at 550 degrees C significantly decreased due to the rapid conversion of the dislocation loops into network dislocations. In addition, subgrains were observed in the Fe-Cr alloys after irradiation. The underlying reason behind the formation of subgrains is discussed in detail.
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页数：10
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