DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Response of 11B enriched ZrB2 ultra-high temperature ceramic to neutron irradiation at elevated temperatures

Journal Article · · Acta Materialia

ZrB2, an ultra-high temperature ceramic (UHTC) is being considered for use in fusion reactor first-wall structures, yet its response to irradiation remains poorly understood. This study employed scanning/transmission electron microscopy (S/TEM), synchrotron X-ray diffraction (XRD), finite element calculations, and thermal property measurements to thoroughly investigate the neutron-irradiation effects on 11B-enriched ZrB2. Neutron irradiations were conducted at 220 °C and 620 °C, with a neutron fluence of 2.2 × 1025 neutron/m2 (energy > 0.1 MeV), resulting in 3.9 dpa and 4200 appm He. The study revealed the unusual prevalence of prism loops and a > c anisotropic lattice swelling, likely linked to the low c/a ratio of ZrB2, leading to grain boundary microcracking. Reducing the grain sizes was effective in reducing intergranular cracking and macroscopic swelling. The observation of cavities in ZrB2 irradiated at 620 °C, as opposed to 220 °C, prompts questions about the temperature at which vacancies in ZrB2 become mobile, and the role of neutron absorption by 10B in elevating irradiation temperatures. Isotopic enrichment in 11B proves to be a viable strategy for mitigating helium production in transition-metal diborides, which is a critical consideration for nuclear applications. Irradiation-induced defects reduce the thermal diffusivity and conductivity of ZrB2 by a factor of 4–9, which has important implications for its role as a plasma-facing material in fusion reactors that drive high heat fluxes through first-wall materials. Here, this comprehensive study lays the foundation for understanding ZrB2 behavior under neutron irradiation and highlights important phenomena to consider for various material applications.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0018322; SC0012704
OSTI ID:
2376345
Alternate ID(s):
OSTI ID: 2373286
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 276; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (71)

Effect of neutron irradiation on defect evolution in Ti3SiC2 and Ti2AlC journal January 2016
Infrastructure development for radioactive materials at the NSLS-II
  • Sprouster, D. J.; Weidner, R.; Ghose, S. K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 880 https://doi.org/10.1016/j.nima.2017.10.053
journal February 2018
Scratch-induced microplasticity and microcracking in zirconium diboride–silicon carbide composite journal August 2008
Nature and thermal stability of radiation defects in single-crystal tungsten journal October 1972
Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation journal May 2021
Evaluation of ultra-high temperature ceramics foraeropropulsion use journal January 2002
Materials for the plasma-facing components of fusion reactors journal August 2004
Densification, mechanical and thermal properties of ZrC1− ceramics fabricated by two-step reactive hot pressing of ZrC and ZrH2 powders journal February 2018
Temperature-dependent cavity swelling in dual-ion irradiated Fe and Fe-Cr ferritic alloys journal April 2021
Thermal Properties of Hf-Doped ZrB 2 Ceramics journal June 2015
Radiological analysis and transmutation calculation of representative castable nanostructured alloys journal November 2020
Neutron irradiation-induced microstructure damage in ultra-high temperature ceramic TiC journal March 2020
Separate effects irradiation testing of miniature fuel specimens journal December 2019
JANIS 4: An Improved Version of the NEA Java-based Nuclear Data Information System journal June 2014
Grain boundary energy anisotropy: a review journal September 2011
High temperature surface effects of He+ implantation in ICF fusion first wall materials journal May 2009
Swelling of ion-irradiated 3C–SiC characterized by synchrotron radiation based XRD and TEM journal December 2014
Densification of ZrB2-based composites and their mechanical and physical properties: A review journal April 2009
The EUROfusion materials property handbook for DEMO in-vessel components—Status and the challenge to improve confidence level for engineering data journal September 2020
Part II: Experimental verification of computationally predicted preferential oxidation of refractory high entropy ultra-high temperature ceramics journal September 2020
Vacancy migration in high-temperature neutron-irradiated molybdenum journal June 1970
Effect of neutron irradiation on select MAX phases journal February 2015
Nuclear Applications for Ultra-High Temperature Ceramics and MAX Phases book October 2014
Neutron irradiation damage in MgO, Al2O3 and MgAl2O4 ceramics journal July 1982
Designing Radiation Resistance in Materials for Fusion Energy journal July 2014
Structural Tolerance of Zirconium Diboride under Electron Irradiation through in-situ Convergent Beam Electron Diffraction and Energy-dispersive X-ray Spectroscopy journal July 2023
Limits on irradiation-induced thermal conductivity and electrical resistivity in silicon carbide materials journal August 2004
Handbook of SiC properties for fuel performance modeling journal September 2007
Comparative Assessment of Material Performance in DEMO Fusion Reactors journal August 2014
Thermal and electrical transport in ZrB2-SiC-WC ceramics up to 1800 °C journal May 2017
ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data journal December 2011
Thickness measurements with electron energy loss spectroscopy journal August 2008
Thermal conductivity degradation of ceramic materials due to low temperature, low dose neutron irradiation journal April 2005
Mechanisms of irradiation-induced growth and cracking in beryllia journal January 1964
Residual strain and the fracture stress-grain size relationship in brittle solids journal February 1964
Neutron cross sections of the boron isotopes for energies between 10 and 500 keV journal July 1966
Swelling of SiC at intermediate and high irradiation temperatures journal August 2007
In situ study on enhanced heavy ion irradiation tolerance of porous Mg journal February 2018
Thermal Conductivity of ZrB2 and HfB2 other October 2014
Evaluation of the continuous dilatometer method of silicon carbide thermometry for passive irradiation temperature determination
  • Field, Kevin G.; McDuffee, Joel L.; Geringer, Josina W.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 445 https://doi.org/10.1016/j.nimb.2019.02.022
journal April 2019
High temperature ion irradiation effects in MAX phase ceramics journal February 2016
Nano-scale microstructure damage by neutron irradiations in a novel Boron-11 enriched TiB2 ultra-high temperature ceramic journal February 2019
High-resolution electron microscopy of neutron-irradiation-induced dislocations in SiC journal October 1990
Fracturing of borides under neutron irradiation journal October 1996
The response of ZrB2 to simulated plasma-facing material conditions of He irradiation at high temperature journal August 2018
Microstructure of Al2O3 and MgAl2O4 preimplanted with H, He, C and irradiated with Ar+ ions journal April 1994
Thermophysical Properties of ZrB 2 and ZrB 2 –SiC Ceramics journal May 2008
Ultra-high temperature ceramics: Materials for extreme environments journal March 2017
Effects of fast neutron irradiation on zirconium carbide journal April 2010
Pushing the limits of atomistic simulations towards ultra-high temperature: A machine-learning force field for ZrB2 journal March 2020
A new type of defect on {1120} planes in ß-Si 3 N 4 produced by neutron irradiation journal April 2001
Refractory Diborides of Zirconium and Hafnium journal May 2007
Microstructure evolution in h.c.p. metals during irradiation journal May 1991
Experimental design and analysis for irradiation of SiC/SiC composite tubes under a prototypic high heat flux journal August 2017
Bubble formation in helium-implanted nanostructured ferritic alloys at elevated temperatures journal September 2021
Microstructure of Al2O3 and MgAl2O4 irradiated at low temperatures journal March 1998
Material property requirements for analysis and design of UHTC components in hypersonic applications journal August 2010
Evolution of microstructure in hcp metals during irradiation journal October 1993
Thermal conductivity degradation induced by point defects in irradiated silicon carbide journal May 2011
The effect of helium on cavity swelling in dual-ion irradiated Fe and Fe-10Cr ferritic alloys journal October 2022
Defect clustering and self-healing of electron-irradiated boron-rich solids journal May 1995
A comparative study of low energy radiation responses of SiC, TiC and ZrC journal May 2016
Helium induced microstructure damage, nano-scale grain formation and helium retention behaviour of ZrC journal January 2019
Methods for Processing ENDF/B-VII with NJOY journal December 2010
Transmission electron microscope studies of neutron irradiated beryllium oxide journal August 1966
Solute segregation in metals under irradiation journal May 1976
An F82H steel pressurized tube creep capsule for irradiation in HFIR journal May 2018
Design, Preparation and Properties of Carbon Fiber Reinforced Ultra-High Temperature Ceramic Composites for Aerospace Applications: A Review journal February 2017
Neutron Sources book August 2014
Limiters for DEMO wall protection: Initial design concepts & technology options journal January 2022
Response of isotopically tailored titanium diboride to neutron irradiation journal September 2018