The Materials Science Division (MSD) at Lawrence Livermore National Laboratory (LLNL) is seeking a highly motivated Postdoctoral Researcher to investigate high-temperature processing and reaction science of rare earth (REE) metals and alloys. Properties of interest include molten metal flow, wetting, and interactions with ceramic or metallic containment, as well as metallothermic reaction pathways during alloying. Understanding reaction mechanisms, intermediate phases, kinetics, and transport phenomena in metal-oxide systems will be a key part of the role. You will design and execute controlled-atmosphere experiments, develop specialized high-temperature equipment, and combine thermal analysis, diffraction, microscopy, and thermodynamic or kinetic interpretation to establish processing-structure-property relationships. The work includes collaborations involving computational fluid dynamics, CALPHAD modeling, and time-resolved synchrotron diffraction. The candidate will publish and present results to internal stakeholders, as well as to the wider scientific community. This position is based in the Advanced Materials Process Science Group within the Materials Science Division and will support LLNL programmatic, Laboratory Directed Research and Development, and externally funded materials research. You will Conduct research in high-temperature processing of rare earth metals, with emphasis on containment compatibility and metallothermic reaction pathways. Design, build, operate, and maintain controlled-atmosphere and high-temperature experimental equipment. Investigate wetting and interface reactions between molten metals and ceramic or metallic containment materials and characterize molten metal flow and ejection dynamics. Determine reaction mechanisms, intermediate phase formation, kinetics, and transport behavior in metal-oxide and multiphase high-temperature systems. Prepare and characterize samples using relevant methods such as thermal analysis, X-ray diffraction, electron microscopy, spectroscopy, metallography, and quantitative image analysis. Publish research results in peer-reviewed journals and present results at conferences, seminars, and technical meetings. Maintain rigorous safety, documentation, and compliance standards in all laboratory activities. Perform other duties as assigned.