Advances in Research on Radiation Effects in Metals

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 25 October 2026 | Viewed by 953

Special Issue Editor


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Guest Editor
1. Department of Mechanical and Materials Engineering, Queen’s University, Nicol Hall, 60 Union Street, Kingston, ON K7L 3N6, Canada
2. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada
Interests: nuclear materials; radiation damage; microstructure; XRD; TEM; mechanical properties; irradiation creep; irradiation swelling
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Special Issue Information

Dear Colleagues,

I invite you to share your insights into radiation effects in materials arising from the use of advanced analytical methods developed in recent years. The advent of focused ion beam technology for the preparation of thin foils for micro-analysis and micro-mechanical specimen preparation has facilitated the study of microstructures and test mechanical properties at sub-micrometer scales. Improvements in computing power have aided the use of electron diffraction in back-scatter and transmission modes to map variations in crystal orientation and defect density at small scales.  Reductions in specimen size have enabled the study of radiation effects when only a small volume of irradiated material is available as is the case for ion irradiations, or when there are high radiation fields from large specimens after neutron irradiation. 

There has been a resurgence of interest in nuclear power globally, and the increasing operating temperatures have introduced new challenges for material development. In many cases, the limits of operability (time, neutron spectrum, and temperature) for conventional alloys have yet to be fully explored. While there are several contesting views concerning radiation effects in materials, novel technologies have improved our ability to better understand these processes.

Dr. Malcolm Griffiths
Guest Editor

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Keywords

  • radiation effects
  • micro-mechanical testing
  • back-scatter and transmission Kikuchi diffraction
  • crystal orientation and misorientation
  • digital image correlation
  • dislocations
  • microstructure

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Published Papers (1 paper)

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Research

22 pages, 9073 KB  
Article
Advances in Modelling of Irradiation Creep Using Rate Theory
by Malcolm Griffiths and Juan Eduardo Ramos Nervi
Metals 2026, 16(3), 312; https://doi.org/10.3390/met16030312 - 11 Mar 2026
Viewed by 409
Abstract
Irradiation creep of engineering alloys in nuclear reactor cores differs from the creep that is observed outside of the irradiation environment. It exhibits characteristics like high temperature thermal creep because it occurs in an environment of elevated vacancy point defect concentrations, but one [...] Read more.
Irradiation creep of engineering alloys in nuclear reactor cores differs from the creep that is observed outside of the irradiation environment. It exhibits characteristics like high temperature thermal creep because it occurs in an environment of elevated vacancy point defect concentrations, but one must also consider the effect of interstitial point defects and the effect of both vacancy and interstitial concentrations, which are greater than the thermal equilibrium values, on an evolving microstructure. Irradiation creep is dependent on the point defect flux to different sinks and can be modelled using conventional rate theory. The net interstitial or vacancy point defect flux to different sinks determines the strain rate in a direction that can be considered perpendicular to the plane of the sink, which is the extra half plane of an edge dislocation or the plane of a grain boundary. There has been increasing evidence that, for complex alloys such as Zr-2.5Nb pressure tubing in CANDU reactors, the irradiation creep is largely dependent on the grain structure (size and shape). While the maximum amount of thermal creep by dislocation slip will be proportional to the distance a dislocation travels, i.e., proportional to the grain dimension in the direction of slip, observations indicate that the magnitude of irradiation creep is inversely proportional to the grain dimensions, indicating a creep mechanism dependent on diffusional mass transport. Mechanistic modelling of irradiation creep based on rate theory is described and used to account for high diametral creep rates observed for pressure tubes with unusual microstructures fabricated by non-standard fabrication routes. Full article
(This article belongs to the Special Issue Advances in Research on Radiation Effects in Metals)
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