SYMPOSIA PAPER Published: 01 January 1990

The Effect of Composition and Phase on Segregation of Fe-Cr Based Alloys


The segregation behavior of Fe-Cr-Mn alloys during electron-irradiation was studied using a high-voltage electron microscope at a temperature range between 723 and 823 K. The ferritic Fe-7Cr-3Mn, Fe-5Cr-5Mn, and Fe-3Cr-7Mn alloys and the austenitic Fe-10Cr-15Mn and Fe-10Cr-15Mn-3Al alloys were used. Irradiation-induced segregation was observed for all of the Fe-Cr-Mn alloys. That is, manganese tended to enrich and chromium deplete near grain boundaries. However, both manganese and chromium were enriched to high concentrations not only at grain boundaries but also in the grain so that new phases were formed. Furthermore, the amount of segregation depended on the initial manganese and chromium solute concentration along with the aluminum addition. From these results it is suggested that compositional changes due to enrichment or depletion or both can result in a phase transformation during irradiation, even local phenomena.

Author Information

Takahashi, H
Hokkaido University, Sapporo, Japan
Shiba, K
Hokkaido University, Sapporo, Japan
Nakahigashi, S
Nuclear Engineering Laboratory, Toshiba Corporation, Kawasaki, Japan
Ohnuki, S
Hokkaido University, Sapporo, Japan
Kinoshita, H
Hokkaido University, Sapporo, Japan
Garner, FA
Pacific Northwest Laboratory, Richland, WA
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Developed by Committee: E10
Pages: 93–102
DOI: 10.1520/STP24951S
ISBN-EB: 978-0-8031-5113-0
ISBN-13: 978-0-8031-1267-4