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Title: Ejecta transport, breakup and conversion

Here, we report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and nonreactive gases. We postulate that reactive metal fragments ejected into a reactive gas, such as H 2, will break up into smaller fragments in situations where they are otherwise hydrodynamically stable in a nonreactive gas such as He. To evaluate the hypothesis we machined periodic perturbations onto thin Ce and Zn coupons and then explosively shocked them to eject hot, micron-scale fragments from the perturbations. The ejecta masses were diagnosed with piezoelectric pressure transducers, and their transport in H 2 and He was imaged with visible and infrared (IR) cameras. Because Ce + H 2 → CeH 2 + ΔH, where ΔH is the enthalpy of formation, an observed increase of the relative IR (radiance) temperature TR between the Ce–H 2 and Ce–He gas systems can be used to estimate the amount of Ce that converts to CeH 2. As a result, the experiments sought to determine whether dynamic chemical effects should be included in ejecta-transport models.
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Yale Univ., New Haven, CT (United States)
  3. National Securities Technologies, Santa Barbara, CA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2199-7446
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 2199-7446
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ejecta; transport; multiphase flow
OSTI Identifier: