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Title: Postimpact examinations of three DOP 4 iridium shells from simulant fuel sphere assemblies

Abstract

Three fuel sphere assemblies, with thoria in doped iridium containment shells, were examined after a simulated earth impact from an aborted orbital mission of a multihundred-watt thermoelectric heat source. The extent of deformation of each unit was measured. Damage to the containment shells was minimal in comparison to that in undoped iridium. Metallographic sections from critical areas indicated that superficial grain boundary cracking in weld zones and microscopic cracking in regions of maximum diameter had occurred in addition to local thinning and coining. The improved properties of the doped iridium are attributed to the retention of a small grain size and to an additional fracture resistance over iridium of a comparable grain size, imparted by either a change in grain boundary chemistry or the flow characteristics of the doped material.

Authors:
;
Publication Date:
Research Org.:
Los Alamos Scientific Lab., N.Mex. (USA)
OSTI Identifier:
7284829
Report Number(s):
LA-6176-MS
TRN: 76-014274
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; PLUTONIUM 238; RADIOISOTOPE HEAT SOURCES; PLUTONIUM DIOXIDE; IMPACT TESTS; CAPSULES; IRIDIUM; PLUTONIUM 239; REENTRY; SIMULATION; THERMOELECTRIC GENERATORS; ACTINIDE COMPOUNDS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CHALCOGENIDES; CONTAINERS; DIRECT ENERGY CONVERTERS; ELEMENTS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAT SOURCES; HEAVY NUCLEI; ISOTOPES; MATERIALS TESTING; MECHANICAL TESTS; METALS; NUCLEI; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; PLUTONIUM COMPOUNDS; PLUTONIUM ISOTOPES; PLUTONIUM OXIDES; RADIOISOTOPES; REFRACTORY METALS; TESTING; TRANSITION ELEMENTS; TRANSURANIUM COMPOUNDS; YEARS LIVING RADIOISOTOPES; NESDPS Office of Nuclear Energy Space and Defense Power Systems; 070300* - Isotopic Power Supplies

Citation Formats

Cramer, E M, and Hecker, S S. Postimpact examinations of three DOP 4 iridium shells from simulant fuel sphere assemblies. United States: N. p., 1975. Web. doi:10.2172/7284829.
Cramer, E M, & Hecker, S S. Postimpact examinations of three DOP 4 iridium shells from simulant fuel sphere assemblies. United States. https://doi.org/10.2172/7284829
Cramer, E M, and Hecker, S S. Mon . "Postimpact examinations of three DOP 4 iridium shells from simulant fuel sphere assemblies". United States. https://doi.org/10.2172/7284829. https://www.osti.gov/servlets/purl/7284829.
@article{osti_7284829,
title = {Postimpact examinations of three DOP 4 iridium shells from simulant fuel sphere assemblies},
author = {Cramer, E M and Hecker, S S},
abstractNote = {Three fuel sphere assemblies, with thoria in doped iridium containment shells, were examined after a simulated earth impact from an aborted orbital mission of a multihundred-watt thermoelectric heat source. The extent of deformation of each unit was measured. Damage to the containment shells was minimal in comparison to that in undoped iridium. Metallographic sections from critical areas indicated that superficial grain boundary cracking in weld zones and microscopic cracking in regions of maximum diameter had occurred in addition to local thinning and coining. The improved properties of the doped iridium are attributed to the retention of a small grain size and to an additional fracture resistance over iridium of a comparable grain size, imparted by either a change in grain boundary chemistry or the flow characteristics of the doped material.},
doi = {10.2172/7284829},
url = {https://www.osti.gov/biblio/7284829}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1975},
month = {12}
}