The influence of helium and heavy ion irradiations on radiation responses of single crystal Cu with nanovoids : An in situ TEM study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
View graph of relations


  • Zhongxia Shang
  • Meimei Li
  • Haiyan Wang
  • Anter El-Azab
  • Xinghang Zhang


Original languageEnglish
Article number118293
Journal / PublicationActa Materialia
Online published21 Aug 2022
Publication statusPublished - Nov 2022
Externally publishedYes


Helium is a common nuclear reaction product, and it plays an important role in radiation-induced void swelling. Although extensive studies have been conducted to investigate the helium effects in metals and alloys, most of them were based on the post-irradiation analyses or computer simulations. Conclusive evidence that can demonstrate how voids evolve in the presence of He under high-temperature radiation remains limited. In this work, we performed in situ heavy ion radiation studies in a transmission electron microscope to compare the radiation response of the preexisting nanovoids in single crystal copper subjected to a single beam of 1 MeV Kr ions and a sequential dual beam of 14 keV He ion and 1 MeV Kr ion at 350 °C. Our studies revealed that the nanovoids would contract continuously until being eliminated when irradiated by a single beam of Kr ions. In comparison, the nanovoids in helium-injected Cu could reach a stable state and eventually stopped shrinking. Moreover, the influence of helium on the kinetics of void/bubble evolution under heavy ion irradiation was discussed within the framework of a proposed critical bubble model and bubble coarsening model.

Research Area(s)

  • Critical Bubble Model, Heavy ion irradiation, Helium effect, In situ TEM, Void shrinkage