Published 1982 | Version v1
Report Restricted

Surface studies of iridium-alloy grain boundaries associated with weld cracking

Creators

Description

Plutonium-238 oxide fuel pellets for the General Purpose Heat Source (GPHS) Radioisotopic Thermoelectric Generators to be used on the NASA Galileo Mission to Jupiter and the International Solar Polar Mission are produced and encapsulated in iridium alloy at the Savannah River Plant (SRP). Underbead cracks occasionally occur in the girth weld on the iridium-alloy-clad vent sets in the region where the gas tungsten arc is quenched. Grain-boundary structures and compositions were characterized by scanning electron microscopy/x-ray energy spectroscopy, electron microprobe analysis and scanning Auger microprobe analysis to determine the cause of weld quench area cracking. Results suggest that weld quench area cracking may be caused by gas porosity or liquation in the grain boundaries

Availability note (English)

MF available from INIS under the Report Number; Available from NTIS, PC A03/MF A01 as DE83004919.

Files

Restricted

The record is publicly accessible, but files are restricted to users with access.

Additional details

Publishing Information

Imprint Pagination
43 p.
Report number
DP-MS--82-49

Conference

Title
11. conference on surface studies and 6. SUBWOG-12B technical exchange.
Dates
5 - 8 Oct 1982.
Place
Los Alamos, NM (USA).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
14761712
Subject category
S07: ISOTOPES AND RADIATION SOURCES; S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
CAPSULES; CRACKS; GRAIN BOUNDARIES; IRIDIUM ALLOYS; PLUTONIUM 238; POROSITY; QUENCHING; RADIOISOTOPE HEAT SOURCES; SCANNING ELECTRON MICROSCOPY; SPACECRAFT POWER SUPPLIES; WELDED JOINTS; X-RAY SPECTROSCOPY
Descriptors DEC
ACTINIDE NUCLEI; ALLOYS; ALPHA DECAY RADIOISOTOPES; CONTAINERS; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; ELECTRONIC EQUIPMENT; ENERGY SOURCES; EQUIPMENT; EVEN-EVEN NUCLEI; HEAT TREATMENTS; HEAVY NUCLEI; ISOTOPES; JOINTS; MICROSCOPY; MICROSTRUCTURE; NUCLEI; PLUTONIUM ISOTOPES; POWER SUPPLIES; RADIOISOTOPES; SPECTROSCOPY; TRANSITION ELEMENT ALLOYS; YEARS LIVING RADIOISOTOPES

Optional Information

Secondary number(s)
CONF-8210112--1.