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Title: Defect evolution in single crystalline tungsten following low temperature and low dose neutron irradiation

Journal Article · · Journal of Nuclear Materials
 [1];  [1];  [2];  [1];  [3];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Tohoku Univ., Sendai (Japan)
  3. Univ. of Tennessee, Knoxville, TN (United States)

The tungsten plasma-facing components of fusion reactors will experience an extreme environment including high temperature, intense particle fluxes of gas atoms, high-energy neutron irradiation, and significant cyclic stress loading. Irradiation-induced defect accumulation resulting in severe thermo-mechanical property degradation is expected. For this reason, and because of the lack of relevant fusion neutron sources, the fundamentals of tungsten radiation damage must be understood through coordinated mixed-spectrum fission reactor irradiation experiments and modeling. In this study, high-purity (110) single-crystal tungsten was examined by positron annihilation spectroscopy and transmission electron microscopy following low-temperature (~90 °C) and low-dose (0.006 and 0.03 dpa) mixed-spectrum neutron irradiation and subsequent isochronal annealing at 400, 500, 650, 800, 1000, 1150, and 1300 °C. The results provide insights into microstructural and defect evolution, thus identifying the mechanisms of different annealing behavior. Following 1 h annealing, ex situ characterization of vacancy defects using positron lifetime spectroscopy and coincidence Doppler broadening was performed. The vacancy cluster size distributions indicated intense vacancy clustering at 400 °C with significant damage recovery around 1000 °C. Coincidence Doppler broadening measurements confirm the trend of the vacancy defect evolution, and the S–W plots indicate that only a single type of vacancy cluster is present. Furthermore, transmission electron microscopy observations at selected annealing conditions provide supplemental information on dislocation loop populations and visible void formation. This microstructural information is consistent with the measured irradiation-induced hardening at each annealing stage. This provides insight into tungsten hardening and embrittlement due to irradiation-induced matrix defects.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC05-00OR22725; DOE-DE-SC0006661
OSTI ID:
1234347
Alternate ID(s):
OSTI ID: 1252047
Journal Information:
Journal of Nuclear Materials, Vol. 470; ISSN 0022-3115
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 85 works
Citation information provided by
Web of Science

References (51)

Recent progress in research on tungsten materials for nuclear fusion applications in Europe journal January 2013
PSI issues at plasma facing surfaces of blankets in fusion reactors journal March 2003
Critical questions in materials science and engineering for successful development of fusion power journal August 2007
Materials to deliver the promise of fusion power – progress and challenges journal August 2004
Recent progress in R&D on tungsten alloys for divertor structural and plasma facing materials journal November 2013
Structural materials for fission & fusion energy journal November 2009
Fusion materials science: Overview of challenges and recent progress journal May 2005
Designing Radiation Resistance in Materials for Fusion Energy journal July 2014
Strain-rate dependence of the brittle-to-ductile transition temperature in tungsten journal June 2007
Precipitation of Solid Transmutation Elements in Irradiated Tungsten Alloys journal January 2008
Effects of Transmutation Elements on Neutron Irradiation Hardening of Tungsten journal January 2007
Effects of transmutation elements on the microstructural evolution and electrical resistivity of neutron-irradiated tungsten journal April 2009
The damage and recovery of neutron irradiated tungsten journal March 1960
Neutron radiation damage in tungsten single crystals journal May 1966
High-Temperature Recovery of Tungsten after Neutron Irradiation journal December 1968
Radiation damage in tungsten: Its influence on the trapping and subsequent thermal desorption of helium journal January 1970
A study of radiation damage in tungsten—I journal January 1970
Neutron irradiation and defect recovery of tungsten journal March 1970
Neutron irradiation effects on tungsten materials journal October 2014
Positron annihilation study of the annealing behaviour of alpha induced defects in tungsten journal April 1992
High temperature annealing of ion irradiated tungsten journal May 2015
Radiation damage and stage iii defect annealing in thermal neutron irradiated tungsten journal March 1978
Effect of Cross-Link Density on Carbon Dioxide Separation in Polydimethylsiloxane-Norbornene Membranes journal October 2015
Overview of fusion nuclear technology in Europe journal November 2002
Calculation of helium defect clustering properties in iron using a multi-scale approach journal June 2006
Positron annihilation spectroscopy in materials structure studies journal January 2002
Accumulation of point defects and their complexes in irradiated metals as studied by the use of positron annihilation spectroscopy – a brief review journal December 2003
Characterization of defect accumulation in neutron-irradiated Mo by positron annihilation spectroscopy journal August 2008
Positron annihilation in neutron irradiated iron-based materials journal January 2011
The half-century of nuclear materials journal May 2010
Quantifying He-point defect interactions in Fe through coordinated experimental and modeling studies of He-ion implanted single-crystal Fe journal November 2013
The growth of helium bubbles in stainless steel at high temperatures journal May 1983
Helium desorption from Fe and V by atomic diffusion and bubble migration journal September 1991
The study of defects in crystals by positron annihilation journal August 1974
Theory of positrons in solids and on solid surfaces journal July 1994
Studies of defects and defect agglomerates by positron annihilation spectroscopy journal November 1997
Study of defect annealing behaviour in neutron irradiated Cu and Fe using positron annihilation and electrical conductivity journal January 2000
Dose dependence of defect accumulation in neutron irradiated copper and iron journal December 2002
Positron annihilation spectroscopy and small angle neutron scattering characterization of nanostructural features in high-nickel model reactor pressure vessel steels journal June 2006
Doppler broadening of annihilation radiation of some single-element materials from the second to the sixth periods journal April 2010
Microstructural evolution of RPV steels under proton and ion irradiation studied by positron annihilation spectroscopy journal March 2015
Coincidence Doppler broadening study of Eurofer 97 irradiated in spallation environment journal March 2015
Positron annihilation in (Ga, Mn)N: A study of vacancy-type defects journal April 2009
Displacement cascades and defects annealing in tungsten, Part I: Defect database from molecular dynamics simulations journal July 2015
Transmutation of Mo, Re, W, Hf, and V in various irradiation test facilities and STARFIRE journal September 1994
Microstructural development of tungsten and tungsten–rhenium alloys due to neutron irradiation in HFIR journal December 2014
Microstructural evolution of irradiated tungsten: Ab initio parameterisation of an OKMC model journal August 2010
Progress Report on Recent Advances in Physical Metallurgy: (C) The Quantitative Relationship between Microstructure and Properties in Two-Phase Alloys journal March 1973
On the relationship between uniaxial yield strength and resolved shear stress in polycrystalline materials journal December 2000
Modeling of irradiation hardening of iron after low-dose and low-temperature neutron irradiation journal July 2014
The relationship between hardness and yield stress in irradiated austenitic and ferritic steels journal February 2005

Cited By (4)

Interplay of solute-mixed self-interstitial atoms and substitutional solutes with interstitial and substitutional helium atoms in tungsten-transition metal alloys journal December 2018
Preparation of Porous Liquid Based on Silicalite-1 journal December 2019
Effect of W self-implantation and He plasma exposure on early-stage defect and bubble formation in tungsten journal April 2018
A tungsten-rhenium interatomic potential for point defect studies journal May 2018

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