Utilization of dual-column focused ion beam and scanning electron microscope for three dimensional characterization of high burn-up mixed oxide fuel

Teague, Melissa; Gorman, Brian P.

doi:10.1016/j.pnucene.2013.08.006

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…[1][2][3] In addition, these experimental results complement and validate modeling and simulation efforts on predicting the coevolution of microstructure and physical properties in irradiated fuel at the mesoscale. 4 The mesoscale information obtained from advanced experimental and simulation capabilities is helping to inform a new generation of materials models for predicting fuel performance that are based on microstructure physics rather the conventional empirical models based on burn-up measurements.…”

Section: Introductionsupporting

confidence: 53%

“…Detailed information about the data collection can be found in Teague et al 2 and Teague and Gorman. 3 The application of the dual-beam FIB to nuclear fuel obtained rare 3D detail of the structure of irradiated fuel. In addition, the gentler polishing produced via the ion beam compared with mechanical polishing allowed features such as small porosity and secondary phases lining pores to be observed that may be otherwise obscured.…”

Section: Experimental Approach and Datamentioning

confidence: 99%

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Using Coupled Mesoscale Experiments and Simulations to Investigate High Burn-Up Oxide Fuel Thermal Conductivity

Teague

Fromm

Tonks

et al. 2014

JOM

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Nuclear energy is a mature technology with a small carbon footprint. However, work is needed to make current reactor technology more accident tolerant and to allow reactor fuel to be burned in a reactor for longer periods of time. Optimizing the reactor fuel performance is essentially a materials science problem. The current understanding of fuel microstructure have been limited by the difficulty in studying the structure and chemistry of irradiated fuel samples at the mesoscale. Here, we take advantage of recent advances in experimental capabilities to characterize the microstructure in 3D of irradiated mixed oxide (MOX) fuel taken from two radial positions in the fuel pellet. We also reconstruct these microstructures using Idaho National Laboratory's MARMOT code and calculate the impact of microstructure heterogeneities on the effective thermal conductivity using mesoscale heat conduction simulations. The thermal conductivities of both samples are higher than the bulk MOX thermal conductivity because of the formation of metallic precipitates and because we do not currently consider phonon scattering due to defects smaller than the experimental resolution. We also used the results to investigate the accuracy of simple thermal conductivity approximations and equations to convert 2D thermal conductivities to 3D. It was found that these approximations struggle to predict the complex thermal transport interactions between metal precipitates and voids.

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Section: Introductionsupporting

confidence: 53%

Section: Experimental Approach and Datamentioning

confidence: 99%

Using Coupled Mesoscale Experiments and Simulations to Investigate High Burn-Up Oxide Fuel Thermal Conductivity

Teague

Fromm

Tonks

et al. 2014

JOM

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“…This approach involves reconstruction of the 3D structure from a series of 2D crystallographic orientation images obtained after repetitive removal of thin layers using focused ion beam milling. (21)(22)(23) Destructive serial sectioning makes this approach not suitable for in-situ measurements. Recently it has been shown that grain inclination with respect to the free surface can be extracted from analysis of the diffraction pattern obtained from the area above the grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Subsurface imaging of grain microstructure using picosecond ultrasonics

Khafizov

Pakarinen

et al. 2016

Acta Materialia

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“…This produces the need for new devices capable of improving the observation of all types of elements, allowing for more detailed analysis of the surface of a material [9][10][11]. This required the development of new microscopes that permit the observation of materials at a smaller scale, via different methods [12] [13].…”

Section: Introductionmentioning

confidence: 99%

Machining With Cutting Tool Coated With Monolayer Of HfN

2016

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In this study, AISI 1020 steel was machined by chip removal, in dry conditions, using ASSAB 17 tool bits with Hafnium Nitride (HfN) monolayer coating, deposited as a thin film via magnetron sputtering physical vapor deposition (PVD) technique, and uncoated tool bits, used as reference system. The surfaces of the machined steel were evaluated and characterized using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The use of monolayer HfN coating on the tool bits was demonstrated to improve the surface finish of the workpiece and reduce cutting process time and cost.Keywords: Monolayer, Surface roughness, Machining, Cutting Tools, Hafnium Nitride. ResumenEn este trabajo, se realizó el mecanizado por arranque de viruta del acero AISI 1020, en condiciones de ausencia de lubricación; utilizando buriles de acero rápido ASSAB 17, con recubrimiento monocapa de Nitruro de Hafnio (HfN) depositados como película delgada, mediante la técnica de deposición física en fase vapor (PVD) magnetrón sputtering y con buriles sin recubrir, usados como sistemas de referencias. Posteriormente se evaluaron las superficies obtenidas en el acero mecanizado, caracterizándolas mediante microscopia de fuerza atómica (MFA) y microscopia electrónica de barrido (MEB). Se evidencio que el uso de recubrimientos monocapa de HfN sobre los buriles de acero rápido, mejoran el acabado superficial del material mecanizado, reduciendo los tiempos y costos del proceso de corte.

show abstract

Utilization of dual-column focused ion beam and scanning electron microscope for three dimensional characterization of high burn-up mixed oxide fuel

Cited by 15 publications

References 25 publications

Using Coupled Mesoscale Experiments and Simulations to Investigate High Burn-Up Oxide Fuel Thermal Conductivity

Using Coupled Mesoscale Experiments and Simulations to Investigate High Burn-Up Oxide Fuel Thermal Conductivity

Subsurface imaging of grain microstructure using picosecond ultrasonics

Machining With Cutting Tool Coated With Monolayer Of HfN

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