4.6 Article

Interface effect of Fe and Fe2O3 on the distributions of ion induced defects

Journal

JOURNAL OF APPLIED PHYSICS
Volume 132, Issue 10, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0095013

Keywords

-

Funding

  1. U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences
  2. U.S. Department of Energy's NNSA [89233218CNA000001]

Ask authors/readers for more resources

This study investigates the small-scale defects created by ion irradiation in metal/oxide bilayers using PALS and TEM techniques. The results show that individual vacancies are formed at low doses and larger vacancy clusters are formed at higher doses. It is also found that the presence of a metal-oxide interface modifies the distribution of radiation-induced point defects. The study demonstrates that the passive oxide layers formed during corrosion have an impact on the distribution and accumulation of radiation-induced defects in the metal underneath.
The stability of structural materials in extreme nuclear reactor environments-with high temperature, high radiation, and corrosive media-directly affects the lifespan of the reactor. In such extreme environments, an oxide layer on the metal surface acts as a passive layer protecting the metal underneath from corrosion. To predict the irradiation effect on the metal layer in these metal/oxide bilayers, nondestructive depth-resolved positron annihilation lifetime spectroscopy (PALS) and complementary transmission electron microscopy (TEM) were used to investigate small-scale defects created by ion irradiation in an epitaxially grown (100) Fe film capped with a 50 nm Fe2O3 oxide layer. In this study, the evolution of induced vacancies was monitored, from individual vacancy formation at low doses-10(-5 )dpa-to larger vacancy cluster formation at increasing doses, showing the sensitivity of positron annihilation spectroscopy technique. Furthermore, PALS measurements reveal how the presence of a metal-oxide interface modifies the distribution of point defects induced by irradiation. TEM measurements show that irradiation induced dislocations at the interface is the mechanism behind the redistribution of point defects causing their accumulation close to the interface. This work demonstrates that the passive oxide layers formed during corrosion impact the distribution and accumulation of radiation induced defects in the metal underneath and emphasizes that the synergistic impact of radiation and corrosion will differ from their individual impacts. Published under an exclusive license by AIP Publishing.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available