Carbon nanotube (CNT) metal composites exhibit greatly reduced radiation damage

Penghui Cao, Kang Pyo So, Yang Yang, Jong Gil Park, Mingda Li, Long Yan, Jing Hu, Mark Kirk, Meimei Li, Young Hee Lee, Michael P. Short, Ju Li

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Radiation damage of structural materials leads to mechanical property degradation, eventually inducing failure. Secondary-phase dispersoids or other defect sinks are often added to materials to boost their radiation resistance. We demonstrate that a metal composite made by adding 1D carbon nanotubes (CNTs) to aluminum (Al) exhibits superior radiation resistance. In situ ion irradiation with transmission electron microscopy (TEM) and atomistic simulations together reveal the mechanisms of rapid defect migration to CNTs, facilitating defect recombination and enhancing radiation tolerance. The origin of this effect is an evolving stress gradient in the Al matrix resulting from CNT transformation under irradiation, and the stability of resulting carbides. Extreme value statistics of large defect behavior in our simulations highlight the role of CNTs in reducing accumulated damage. This approach to controlling defect migration represents a promising opportunity to enhance the radiation resistance of nuclear materials without detrimental effects.

Original languageEnglish (US)
Article number116483
JournalActa Materialia
Volume203
DOIs
StatePublished - Jan 15 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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