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

L. X. Yang, S. J. Zheng, Y. T. Zhou, J. Zhang, Y. Q. Wang, C. B. Jiang, N. A. Mara, I. J. Beyerlein, X. L. Ma

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)311-316
Number of pages6
JournalJournal of Nuclear Materials
Volume487
DOIs
StatePublished - Apr 15 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Cavity
  • Interface
  • Nanolayered composite
  • Radiation
  • Softening

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