Effects of He radiation on cavity distribution and hardness of bulk nanolayered Cu-Nb composites

被引：30

作者：

Yang, L. X. ^{[1
]}

Zheng, S. J. ^{[1
]}

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

Zhang, J. ^{[2
]}

Wang, Y. Q. ^{[3
,4
]}

Jiang, C. B. ^{[1
]}

Mara, N. A. ^{[3
,4
]}

Beyerlein, I. J. ^{[5
]}

Ma, X. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] Xiamen Univ, Sch Energy Res, Xiamen 361005, Peoples R China

[3] Los Alamos Natl Lab, LAM Inst Mat Sci, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[5] Univ Calif Santa Barbara, Mech Engn Dept, Mat Dept, Santa Barbara, CA 93106 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2017年 / 487卷

基金：

中国国家自然科学基金;

关键词：

Interface; Cavity; Softening; Radiation; Nanolayered composite; BIMETAL INTERFACES; HELIUM; IRRADIATION; NANOCOMPOSITES; DEFORMATION; METALS; COPPER; DISLOCATIONS; IMPLANTATION; MECHANISMS;

D O I：

10.1016/j.jnucmat.2017.02.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Interface engineering is an important strategy for developing radiation tolerant materials. In prior work, bulk nanolayered composites fabricated by accumulative roll bonding (ARB) showed outstanding radiation resistance. However, the effects of layer thickness and radiation conditions on damage distributions and their effect on hardness have not been explored. Here, we use transmission electron microscopy (TEM) and nanoindentation to investigate the effects of radiation on the distribution of radiation-induced cavities and post-radiation hardness in ARB nanolayered Cu-Nb composites. We show that whether the cavities cross the interface depends on layer thickness and temperature, and that, remarkably, radiation could generate softening, not always hardening. We posit that the softening mainly results from the recovery of dislocations stored in the crystal after the bulk forming ARB processing due to He radiation and this phenomenon offsets radiation-induced hardening as layers become finer and temperatures rise. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：311 / 316

页数：6

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