He+ ion irradiation response of Fe-TiO2 multilayers

被引：15

作者：

Anderoglu, O. ^{[1
]}

Zhou, M. J. ^{[1
]}

Zhang, J. ^{[1
]}

Wang, Y. Q. ^{[1
]}

Maloy, S. A. ^{[1
]}

Baldwin, J. K. ^{[1
]}

Misra, A. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2013年 / 435卷 / 1-3期

关键词：

RADIATION-DAMAGE; HELIUM; TOLERANCE; ALLOYS; DESIGN;

D O I：

10.1016/j.jnucmat.2012.12.036

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The accumulation of radiation-induced defect clusters and He bubble formation in He+ ion irradiated nanocrystalline TiO2 and Fe-TiO2 multilayer thin films were investigated using transmission electron microscopy (TEM). Prior to ion irradiation it was found that the crystallinity of TiO2 layers depends on the individual layer thickness: While all TiO2 layers are amorphous at 5 nm individual layer thickness, at 100 nm they are crystalline with a rutile polymorph. After He+ irradiation up to similar to 6 dpa at room temperature, amorphization of TiO2 layers was not observed in both nanocrystalline TiO2 single layers and Fe-TiO2 multilayers. The suppression of radiation-induced amorphization in TiO2 is interpreted in terms of a high density of defect sinks in these nano-composites in the form of Fe-TiO2 interphase boundaries and columnar grains within each layer with nano-scale intercolumnar porosity. In addition, a high concentration of He is believed to be trapped at these interfaces in the form of sub-nanometer-scale clusters retarding the formation of relatively larger He bubbles that can be resolved in TEM. Published by Elsevier B.V.

引用

页码：96 / 101

页数：6

共 34 条

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