Grain boundary cavitation and weld underbead cracking in DOP-26 iridium alloy

Journal Article · Fri Dec 31 23:00:00 EST 1982 · Microbeam Anal.; (United States)

OSTI ID:6645590

Mosley, Jr, W C

Plutonium-238 oxide fuel pellets for the General Purpose Heat Source Radioisotopic Thermoelectric Generators to be used on the NASA Galileo Mission to Jupiter and the International Solar Polar Mission are produced and encapsulated in DOP-26 iridium alloy at the Savannah River Plant. DOP-26 iridium alloy was developed at the Oak Ridge National Laboratory (ORNL) and contains nominally 0.3 wt.% tungsten, 60 ppm thorium, and 50 ppm aluminum. Underbead cracks occasionally occur in the girth weld on the iridium alloy cladding in the area where the gas tungsten arc is quenched. Various electron-beam techniques have been used to determine the cause of cracking.

• Research Organization: E.I. du Pont de Nemours and Co., Aiken, SC
• DOE Contract Number: AC09-76SR00001
• OSTI ID: 6645590
• Journal Information: Microbeam Anal.; (United States), Journal Name: Microbeam Anal.; (United States); ISSN MBAND
• Country of Publication: United States
• Language: English

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