期刊
JOURNAL OF NUCLEAR MATERIALS
卷 487, 期 -, 页码 311-316出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2017.02.022
关键词
Interface; Cavity; Softening; Radiation; Nanolayered composite
资金
- Chinese Academy of Sciences
- Thousand Youth Talents Plan of China
- National Natural Science Foundation of China [51401208]
- Shenyang National Laboratory for Materials Science [2015RP18]
- U.S. Department of Energy [DE-AC52-06NA25396]
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.
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