Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 445, Issue 1-3, Pages 104-110Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2013.11.003
Keywords
Nanoprecipitates; Radiation resistance; Dissolution; Reprecipitation; Displacement cascades
Funding
- U.S. Department of Energy (DOE), Office of Fusion Energy Sciences [DE-AC05-00OR22725]
- UT-Battelle, LLC
- ORNL's Center for Nanophase Materials Sciences (CNMS)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE
- U.S. DOE, Office of Nuclear Energy under DOE Idaho Operations Office [DE-AC07-051D14517]
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The stability of MX-type precipitates is critical to retain mechanical properties of both reduced activation ferritic-martensitic (RAFM) and conventional FM steels at elevated temperatures. Radiation resistance of TaC, TaN, and VN nanoprecipitates irradiated up to similar to 49 dpa at 500 degrees C using Fe2+ is investigated in this work. Transmission electron microscopy (TEM) utilized in standard and scanning mode (STEM) reveals the non-stoichiometric nature of the nanoprecipitates. Irradiation did not alter their crystalline nature. The radiation resistance of these precipitates, in an order of reduced resistance, is TaC, VN, and TaN. Particle dissolution, growth, and reprecipitation were the modes of irradiation-induced instability. Irradiation also facilitated formation of Fe2W type Laves phase limited to the VN and TaN bearing alloys. This result suggests that nitrogen level should be controlled to a minimal level in alloys to gain greater radiation resistance of the MX-type precipitates at similar temperatures as well as postpone the formation and subsequent coarsening of Laves phase. (C) 2013 Elsevier B.V. All rights reserved.
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