Journal ArticleDOI
Amorphization of SiC under ion and neutron irradiation
Reads0
Chats0
TLDR
In this paper, the microstructure and physical properties of 6H-SiC amorphized by both ion and neutron irradiation were analyzed using high-resolution transmission electron microscopy (HRTEM).Abstract:
This paper presents results on the microstructure and physical properties of SiC amorphized by both ion and neutron irradiation. Specifically, 0.56 MeV Si ions have been implanted in single crystal 6H–SiC from ambient through >200°C and the critical threshold for amorphization was measured as a function of the irradiation temperature. From a high resolution transmission electron microscopy (HRTEM) study of the crystalline to amorphous transition region in these materials, elongated pockets of amorphous material oriented parallel to the free surface are observed. Single crystal 6H–SiC and hot pressed and sintered 6H and 3C SiC were neutron irradiated at approximately 70°C to a dose of ∼2.56 dpa causing complete amorphization. Property changes resulting from the crystal to amorphous transition in SiC include a density decrease of 10.8%, a hardness decrease from 38.7 to 21.0 GPa, and a decrease in elastic modulus from 528 to 292 GPa. Recrystallization of the amorphized, single crystal 6H–SiC appears to occur in two stages. In the temperature range of ∼800–1000°C, crystallites nucleate and slowly grow. In the temperature range of 1125–1150°C spontaneous nucleation and rapid growth of crystallites occur. It is further noted that amorphized 6H (alpha) SiC recrystallizes to highly faulted fcc (beta) SiC.read more
Citations
More filters
Journal ArticleDOI
Handbook of SiC properties for fuel performance modeling
TL;DR: In this paper, a compilation of non-irradiated and irradiated properties of SiC are provided and reviewed and analyzed in terms of application to TRISO fuels, specifically in the high-temperature irradiation regime.
Journal ArticleDOI
Designing Radiation Resistance in Materials for Fusion Energy
TL;DR: In this article, three fundamental options for designing radiation resistance are outlined: Utilize matrix phases with inherent radiation tolerance, select materials in which vacancies are immobile at the design operating temperatures, or engineer materials with high sink densities for point defect recombination.
Journal ArticleDOI
Operating temperature windows for fusion reactor structural materials
Steven J. Zinkle,Nasr M. Ghoniem +1 more
TL;DR: In this paper, a critical analysis is presented of the operating temperature windows for nine candidate fusion reactor structural materials: four reduced-activation structural materials (oxide-dispersion-strengthened and ferritic/martensitic steels containing 8-12%Cr, V-4Cr-4Ti, and SiC/SiC composites), copper-base alloys (CuNiBe), tantalum base alloys, and molybdenum and tungsten alloys.
Journal ArticleDOI
Playing with carbon and silicon at the nanoscale.
TL;DR: In this article, the theoretical principles associated with SiC cage-like clusters and experimental work resulting from them are discussed and a review is placed on the theoretical and experimental results of these structures.
Journal ArticleDOI
Radiation tolerance of Mn+1AXn phases, Ti3AlC2 and Ti3SiC2
Karl R. Whittle,Mark G. Blackford,Robert D. Aughterson,S. Moricca,Gregory R. Lumpkin,Daniel P. Riley,Nestor J. Zaluzec +6 more
TL;DR: In this paper, ternary carbides with compositions Ti{sub 3}AlC{sub 2} and SiC{Sub 2} have been irradiated with high Xe fluences, 6.25 x 10{sup 15} ions cm{sup -2} ({approx}25-30 dpa), using the IVEM-TANDEM facility at Argonne National Laboratory.
References
More filters
Book
The stopping and range of ions in solids
J.P. Biersack,James F. Ziegler +1 more
TL;DR: A review of existing widely-cited tables of ion stopping and ranges can be found in this paper, where a brief exposition of what can be determined by modern calculations is given.
Journal ArticleDOI
The radiation-induced crystalline-to-amorphous transition in zircon
TL;DR: A comprehensive understanding of radiation effects in zircon, ZrSiO4, over a broad range of time scales (0.5 h to 570 million years) has been obtained by a study of natural ZIRcon, Pu-doped Zircon and ion-beam irradiated Zrcon as discussed by the authors.
Journal ArticleDOI
Ion implantation and annealing of crystalline oxides
TL;DR: In this paper, the response of a wide range of crystalline oxides to ion implantation and subsequent thermal processing is reviewed, including Al 2 O 3, LiNbO 3, CaTiO 3, SrTiO3, ZnO, and MgO, as well as the nonoxide materials Si 3 N 4 and SiC.
Journal ArticleDOI
Influence of irradiation spectrum and implanted ions on the amorphization of ceramics
TL;DR: In this paper, the authors investigated the effect of implantation of certain chemical species on amorphization in polycrystalline specimens of alumina, magnesium aluminate spinel (MgAl2O4), Magnesia, silicon nitride (Si3N4), silicon carbide (SiC), and silicon oxide ceramics.