Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Multiphase”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 685 records · Page 38
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Methods for multiphase laser ablation analysis

Methods of liquid and solid materials analysis by laser induced ablation spectroscopy are disclosed. The liquid and solid materials are analyzed in an instrument having one pulsed laser to produce emissive plasma plumes and ablate solid material. Liquid phase samples are aerosolized before streaming to an analysis zone where they are dissociated into a plasma plume. A large number of sites within solid phase sample structures and be analyzed using a movable x-y-z stage and displayed in a chemical map.

Bol'shakov, Alexander A.↗
DOE OSTI2016

Radiation Damage in Multiphase Ceramics

Ceramics belong to the promising class of radiation damage resistant materials. In highly radiation damage tolerant materials, defect annihilation counteracts and mitigates defects generated by irradiation. One route to annihilate defects is the migration of point defects to grain boundaries, which act as efficient sinks for defects. Defect migration to the grain boundaries can be enhanced by shortening the distance between the grain boundary sinks and the defects. Thus nano-crystalline ceramics have been observed to be more tolerant to radiation damage than ceramics with larger grains. However, at high temperatures, which typically exist in a nuclear reactor, nano-grains in single-phase materials will grow and irradiation induces additional grain growth. Once the grains grow larger, the material will no longer be as radiation resistant. In this study, new composite materials are to be engineered that will retain the fine grain size under irradiation at high temperature. Multiple phases of different chemical compositions inhibit grain growth by blocking the diffusion pathway between like phases. (authors)

36 MATERIALS SCIENCE↗