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.

引用

页数：10

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