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The Correlation Between Swelling and Radiation-Induced Segregation in Iron-Chromium-Nickel Alloys / TR. Allen, JT. Busby, J. Gan, EA. Kenik, GS. Was

Conference Author
Effects of Radiation on Materials: 19th International Symposium (19th : 1998 : Seattle, Washington)
Physical Description
1 online resource (17 pages) : illustrations, figures, tables
Additional Creators
Was, GS., Allen, TR., Busby, JT., Gan, J., Kenik, EA., American Society for Testing and Materials, and ASTM International
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Summary
The magnitudes of both void swelling and radiation-induced segregation (RIS) in austenitic iron-chromium-nickel alloys are dependent on bulk alloy composition. In this work, the resistance to swelling from major element segregation is estimated and alloys with greater nickel enrichment and fast-developing segregation profiles are shown to be less prone to swelling. In austenitic iron-chromium-nickel alloys, the total swelling depends on the duration of the transient swelling period that precedes steady-state swelling. A longer transient swelling period leads to less overall swelling for the same irradiation dose. The duration of this transient period depends on the void nucleation rate which is determined directly by the average vacancy diffusivity and indirectly by the magnitude of the segregation to the void surface. Alloys with faster vacancy diffusion have a slower void nucleation rate, a longer transient swelling period, and less swelling. Radiation-induced segregation affects swelling by decreasing the vacancy flux to the void. Because the diffusivity of nickel via the vacancy flux is slow relative to chromium, nickel enriches and chromium depletes at void surfaces during irradiation in all austenitic iron-chromium-nickel alloys. This local composition change reduces the subsequent vacancy flux to the voids, increasing the bulk point defect recombination rate, reducing the bulk vacancy concentration, which further reduces the nucleation rate and swelling. Alloys that display the greatest amount of nickel enrichment and chromium depletion are found to be most resistant to void swelling, as predicted from both void nucleation and void growth considerations.
Dates of Publication and/or Sequential Designation
Volume 2000, Issue 1366 (January 2000)
Subject(s)
Other Subject(s)
ISBN
9780803154193 (e-ISBN)
9780803128521
0803128525
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 34.
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Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2000. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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