Seth Imhoff
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View article: In-situ Monitoring of Dynamic Phenomena during Solidification and Phase Transformation Processing
In-situ Monitoring of Dynamic Phenomena during Solidification and Phase Transformation Processing Open
The purpose of this project is to: (1) Directly observe phase transformations and microstructure evolution using proton (and synchrotron x-ray) radiography and tomography; (2) Constrain phase-field models for microstructure evolution; (3) …
View article: Problems, Pictures and Stories… with Solidification [Slides]
Problems, Pictures and Stories… with Solidification [Slides] Open
Additional technological configurations were pursued, including (1) nanofiltration combined with zeolite dewatering for a near-zero liquid discharge (ZLD) scenario, and (2) polishing discharge from zeolite dewatering using capacitive deion…
View article: Investigation of Carbide Inclusions in Cast Uranium [Slides]
Investigation of Carbide Inclusions in Cast Uranium [Slides] Open
Outline - Introduction: The motivations for the project, and some background on inclusions in uranium, and about the samples; Lath Inclusion Morphology: Looking at the morphology of a specific family of carbide inclusions in casting 20; Cl…
View article: Solidification Science at Sigma Overview [Slides]
Solidification Science at Sigma Overview [Slides] Open
offers diverse, complex, and valuable building blocks and products. Second, Consortium researchers developed technologies to enable process intensification, which can reduce equipment needs, energy consumption, and waste generation, thereb…
View article: Nucleation kinetics model for primary crystallization in Al–Y–Fe metallic glass
Nucleation kinetics model for primary crystallization in Al–Y–Fe metallic glass Open
The high density of aluminum nanocrystals (>1021 m−3) that develop during the primary crystallization in Al-based metallic glasses indicates a high nucleation rate (∼1018 m−3 s−1). Several studies have been advanced to account for the p…
View article: U-rich U-Mo Solidus, Liquidus, Enthalpy, and Thermal Diffusivity
U-rich U-Mo Solidus, Liquidus, Enthalpy, and Thermal Diffusivity Open
Several material properties have been studied as a function of composition as part of the USHPRR effort to use U-10Mo for LEU monolithic fuel foils, with special attention to areas where simulation outcomes can be improved. The liquidus an…
View article: Sigma Casting Report: 16C-791,792,795
Sigma Casting Report: 16C-791,792,795 Open
For validation of simplified cylindrical casting simulations this report covers basic data about the setup and casting of 3 similar 4x12 right cylinders.
View article: Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb): Final Project Report
Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb): Final Project Report Open
This report summarizes the outcomes of a 3-year NA-22 exploratory project to research the feasibility of tagging uranium materials, especially nuclear fuels, for nuclear nonproliferation purposes. The experimental focus was on metallic ura…
View article: Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb) (Annual Report for FY21)
Intentional Uranium Tagging for Material Provenance and Pathway Forensics (LA19-Intentional-Forensics-NDD3Bb) (Annual Report for FY21) Open
This report describes the outcomes of the third and final year of a project to research the feasibility of tagging uranium materials, especially nuclear fuels. The experimental focus remained on metallic uranium forms under prospective sur…
View article: Uranium Density, Thermal Conductivity, Specific Heat, and Thermal Diffusivity
Uranium Density, Thermal Conductivity, Specific Heat, and Thermal Diffusivity Open
Thermophysical properties for pure uranium are collected here as a common and maintained resource with a focus on casting. Source material details will be provided for decisions on fitting emphasis. The four material properties represented…
View article: Microwave Cast Material Examination
Microwave Cast Material Examination Open
Microwave-cast material dating from the latest prototype development period and subsequent TRL 7 advancement testing was sent to LANL for additional characterization. The initial characterization described here is considered a supplement t…
View article: Defects and Mechanical Behavior of Plutonium [Slides]
Defects and Mechanical Behavior of Plutonium [Slides] Open
Defects are important because they heavily influence material properties (e.g. strength, ductility, elasticity, conductivity, phase transformation temperatures (melting point), corrosion resistance, etc.). At LANL defects in plutonium are …
View article: Demonstration of transmission high energy electron microscopy
Demonstration of transmission high energy electron microscopy Open
Charged particle radiography with 800 MeV protons has been used for decades at LANL and developed around the world to study dynamic material properties. Recently, charged particle radiography has been demonstrated with the use of high-ener…
View article: Convert Triple Plate: Casting Process Upset Simulations
Convert Triple Plate: Casting Process Upset Simulations Open
Advanced casting modeling has been utilized to more fully explore and explain a case study from U-10Mo triple plate production. The case study involved a configuration difference between two furnaces that lead to systematic casting defects…
View article: Effect of Filtration on Inclusion and Carbon Reduction (FY19 Report)
Effect of Filtration on Inclusion and Carbon Reduction (FY19 Report) Open
Casting of U-10Mo using vacuum induction melting (VIM) technology has been selected as the first processing step for the conversion of high-enriched uranium based fuels to low-enriched uranium based fuels. One source of potential variabili…
View article: FY18 Report: HFIR Fuel Casting Support and Microstructural Feature Examination
FY18 Report: HFIR Fuel Casting Support and Microstructural Feature Examination Open
An effort to commence conversion of the High Flux Isotope Reactor (HFIR) to a low enriched uranium (LEU) based fuel has been proposed. While recent experience from LEU-10wt%Mo (U-10Mo) monolithic metal fuel production may be leveraged cons…
View article: Demonstration of transmission high energy electron microscopy
Demonstration of transmission high energy electron microscopy Open
High energy electrons have been used to investigate an extension of transmission electron microscopy. This technique, transmission high energy electron microscopy (THEEM), provides two additional capabilities to electron microscopy. First,…
View article: HFIR Fuel Casting Support
HFIR Fuel Casting Support Open
Process exploration for fuel production for the High Flux Isotope Reactor (HFIR) using cast LEU-10wt.%Mo as an initial processing step has just begun. This project represents the first trials concerned with casting design and quality. The …
View article: Fan Fuel Casting Final Report
Fan Fuel Casting Final Report Open
LANL was approached to provide material and design guidance for a fan-shaped fuel element. A total of at least three castings were planned. The first casting is a simple billet mold to be made from high carbon DU-10Mo charge material. The …
View article: DU Processing Efficiency and Reclamation: Plasma Arc Melting
DU Processing Efficiency and Reclamation: Plasma Arc Melting Open
The work described here corresponds to one piece of a larger effort to increase material usage efficiency during DU processing operations. In order to achieve this goal, multiple technologies and approaches are being tested. These technolo…
View article: From Solidification Processing to Microstructure to Mechanical Properties: A Multi-scale X-ray Study of an Al-Cu Alloy Sample
From Solidification Processing to Microstructure to Mechanical Properties: A Multi-scale X-ray Study of an Al-Cu Alloy Sample Open
We follow an Al-12 at. pct Cu alloy sample from the liquid state to mechanical failure, using in situ X-ray radiography during directional solidification and tensile testing, as well as three-dimensional computed tomography of the microstr…
View article: The effect of distribution of second phase on dynamic damage
The effect of distribution of second phase on dynamic damage Open
For ductile metals, dynamic fracture occurs principally through void nucleation, growth, and coalescence at heterogeneities in the microstructure. Previous experimental research on high purity metals has shown that microstructural features…
View article: From Alloy Processing to Performance: An In Situ Experimental and Modeling Effort
From Alloy Processing to Performance: An In Situ Experimental and Modeling Effort Open
Solidification is present in almost all materials. It is influenced by grain size and shape, chemical homogeneity, defect type and density, and mechanical properties. During micro-mechanical testing, the following occur: 1) Micro-CT (as pr…
View article: New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)
New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE) Open
An application of nuclear physics, a facility for using protons for flash radiography, was developed at the Los Alamos Neutron Science Center (LANSCE). Protons have proven far superior to high energy x-rays for flash radiography because of…