非晶态SiOC/晶态Fe纳米复合材料中氦气泡形成的抗性

Resistance to Helium Bubble Formation in Amorphous SiOC/Crystalline Fe Nanocomposite.

作者信息

Su Qing, Wang Tianyao, Gigax Jonathan, Shao Lin, Nastasi Michael

机构信息

Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68583-0857, USA.

Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3128, USA.

出版信息

Materials (Basel). 2018 Dec 28;12(1):93. doi: 10.3390/ma12010093.

DOI:10.3390/ma12010093

PMID:30597850

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6337212/

Abstract

The management of radiation defects and insoluble He atoms represent key challenges for structural materials in existing fission reactors and advanced reactor systems. To examine how crystalline/amorphous interface, together with the amorphous constituents affects radiation tolerance and He management, we studied helium bubble formation in helium ion implanted amorphous silicon oxycarbide (SiOC) and crystalline Fe composites by transmission electron microscopy (TEM). The SiOC/Fe composites were grown via magnetron sputtering with controlled length scale on a surface oxidized Si (100) substrate. These composites were subjected to 50 keV He+ implantation with ion doses chosen to produce a 5 at% peak He concentration. TEM characterization shows no sign of helium bubbles in SiOC layers nor an indication of secondary phase formation after irradiation. Compared to pure Fe films, helium bubble density in Fe layers of SiOC/Fe composite is less and it decreases as the amorphous/crystalline SiOC/Fe interface density increases. Our findings suggest that the crystalline/amorphous interface can help to mitigate helium defect generated during implantation, and therefore enhance the resistance to helium bubble formation.

摘要

辐射缺陷和不可溶氦原子的管理是现有裂变反应堆和先进反应堆系统中结构材料面临的关键挑战。为了研究晶体/非晶界面以及非晶成分如何影响耐辐射性和氦管理，我们通过透射电子显微镜（TEM）研究了氦离子注入非晶碳化硅氧（SiOC）和晶体铁复合材料中的氦泡形成。SiOC/Fe复合材料通过磁控溅射在表面氧化的Si(100)衬底上生长，长度尺度可控。这些复合材料接受50 keV的He+注入，离子剂量选择为产生5 at%的峰值He浓度。TEM表征显示SiOC层中没有氦泡迹象，辐照后也没有二次相形成的迹象。与纯铁膜相比，SiOC/Fe复合材料中铁层的氦泡密度较小，并且随着非晶/晶体SiOC/Fe界面密度的增加而降低。我们的研究结果表明，晶体/非晶界面有助于减轻注入过程中产生的氦缺陷，从而增强抗氦泡形成的能力。