Grain size effect on radiation tolerance of nanocrystalline Mo

被引：75

作者：

Cheng, G. M. ^{[1
]}

Xu, W. Z. ^{[1
]}

Wang, Y. Q. ^{[2
]}

Misra, A. ^{[3
]}

Zhu, Y. T. ^{[1
]}

机构：

[1] North Carolina State Univ, Dept Mat Sci & Engn, Box 7907, Raleigh, NC 27695 USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[3] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

来源：

SCRIPTA MATERIALIA | 2016年 / 123卷

基金：

美国国家科学基金会;

关键词：

Radiation damage; Body-centered cubic (bcc); Nanocrystalline; Grain size effect; Magnetron sputtering; MICROSCOPE IMAGE-CONTRAST; SMALL DISLOCATION LOOPS; THEORETICAL PREDICTIONS; DEFORMATION MECHANISMS; DAMAGE; HELIUM; TEMPERATURE; STRENGTH; VACANCY; STRAIN;

D O I：

10.1016/j.scriptamat.2016.06.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report a significant grain size effect on radiation tolerance of nanocrystalline Mo under He ion irradiation. Irradiation -induced dislocation loops mainly contribute to the irradiation-induced hardening of Mo films with grain size of >90 nm, while few such loops in those with grain size of <90 nm. The hardness increment after irradiation decreases with decreasing the grain size, and approaches zero at the grain size of 25 nm. Also, the size and the density of irradiation-induced He bubbles decrease as the grain size decreases. This observation provides direct evidence that nanocrystalline body-centered-cubic metals have greater radiation tolerance than their ultra-fine-grained or coarse-grained counterparts. Published by Elsevier Ltd.

引用

页码：90 / 94

页数：5

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