Grain size threshold for enhanced irradiation resistance in nanocrystalline and ultrafine tungsten

被引:98
作者
El-Atwani, O. [1 ]
Hinks, J. A. [2 ]
Greaves, G. [2 ]
Allain, J. P. [3 ]
Maloy, S. A. [4 ]
机构
[1] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[2] Univ Huddersfield, Sch Comp & Engn, Huddersfield, W Yorkshire, England
[3] Univ Illinois, Dept Nucl Plasma & Radiol Engn, Urbana, IL USA
[4] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA
来源
MATERIALS RESEARCH LETTERS | 2017年 / 5卷 / 05期
基金
英国工程与自然科学研究理事会;
关键词
He implantation; TEM; bubbles; nanocrystalline; grain boundary; HELIUM BUBBLE NUCLEATION; GROWTH; BOUNDARIES;
D O I
10.1080/21663831.2017.1292326
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanocrystalline metals are considered highly radiation-resistant materials due to their large grain boundary areas. Here, the existence of a grain size threshold for enhanced irradiation resistance in high-temperature helium-irradiated nanocrystalline and ultrafine tungsten is demonstrated. Average bubble density, projected bubble area and the corresponding change in volume were measured via transmission electron microscopy and plotted as a function of grain size for two ion fluences. Nanocrystalline grains of less than 35 nm size possess similar to 10-20 times lower change in volume than ultrafine grains and this is discussed in terms of the grain boundaries defect sink efficiency. [GRAPHICS] . IMPACT STATEMENT A grain size threshold in nanocrystalline and ultrafine tungsten has been shown to exist for enhanced irradiation-resistance performance during high-temperature helium irradiation.
引用
收藏
页码:343 / 349
页数:7
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