Journal
SCRIPTA MATERIALIA
Volume 61, Issue 8, Pages 793-796Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.06.034
Keywords
Mechanical alloying; Oxide dispersion-strengthened (ODS) alloy; Nanocluster (NC); Atom probe tomography; Creep test
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Funding
- Division of Materials Sciences and Engineering, US Department of Energy [DE-AC05-00OR22725]
- Division of Scientific User Facilities, Office of Basic Energy Sciences, US Department of Energy
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The microstructure and mechanical properties of ultrafine-grained ferritic alloys containing nanoclusters (NCs) are investigated. The NCs (diameter similar to 3 nm) as well as the grain size (similar to 200 nm) remain stable at 1000 degrees C. Substantial Hall-Petch strengthening occurs at room temperature. Surprisingly, the creep rate at 800 degrees C is up to a factor of 10(8) slower than that predicted for diffusional creep. Possible reasons are the high NC coverage as well as Cr and W enrichment at the grain boundaries, and inhibition of self-diffusion. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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