期刊
JOURNAL OF NUCLEAR MATERIALS
卷 442, 期 1-3, 页码 7-16出版社
ELSEVIER
DOI: 10.1016/j.jnucmat.2013.07.071
关键词
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资金
- DOE Office of Nuclear Energy's Nuclear Energy University Programs [DE-FG07-07ID14828, DE-FG07-07ID14894]
- ORNL's Shared Research Equipment (ShaRE) User Program
- Office of Basic Energy Sciences, the U.S. Department of Energy
A systematic approach to measuring radiation-induced segregation (RIS) was used on four ferritic-martensitic (F-M) alloys: T91, HCM12A, HT9, and a Fe-9Cr model alloy, irradiated with 2.0 MeV protons over a range of doses (1-10 dpa) and temperatures (300-700 degrees C). The experimental conditions are established so as to isolate the dependence of RIS on the experimental parameters: temperature, dose and bulk composition. RIS is measured at prior austenite grain boundaries (PAGBs) using the STEM/EDX technique. Chromium is found to enrich at PAGBs in all conditions with the exception being T91 irradiated to 3 dpa at 700 degrees C. The magnitude of enrichment is small (<2 at%). Minor elements Si, Ni, and Cu also enrich consistently. A bell-shaped temperature dependence of RIS is observed in all elements. The amount of Cr enrichment decreases as a function of increasing bulk Cr concentration. Lastly, it is found that the 9Cr model alloy reaches a steady-state Cr RIS behavior at approximately 7 dpa, while the T91 reaches what may be a steady state near 3 dpa, then the amount of enrichment decreases at 10 dpa. (C) 2013 Elsevier B.V. All rights reserved.
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