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EFTEM Elemental Mapping of α-α′ Interconnected Isotropic Nanostructures Formed by Spinodal Decomposition of Ferrite in Aged CF8 Cast Duplex Steel

Published online by Cambridge University Press:  02 July 2020

J. Bentley
J. Bentley*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN37832-6376
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Extract

Phase separation by spinodal decomposition of body centered cubic Fe-Cr binary alloys to form isotropic fully interconnected nanostructures of Fe-rich α and Cr-enriched α′ phases typically on a scale of 2 to 10 nm is scientifically intriguing and technologically important. In aged dual-phase steels, it is the decomposition of the ferrite to form such α-α′ composition modulations that is primarily responsible for the increased ferrite hardness that contributes to embrittlement. The α′ structures are isotropic since the lattice constants of the two phases are almost identical and consequently the strain energy is small. In other spinodal systems larger strain energy leads to triaxially modulated structures aligned along <100> in cubic materials. A review of TEM characterization of spinodal alloys revealed that aligned structures had received the most attention, because they are more common and their characterization by TEM is more tractable.

Type
Phase Transformations
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 362 - 363
Copyright
Copyright © Microscopy Society of America

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References

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6. Research at the ORNL SHaRE User Facility sponsored by the Division of Materials Sciences and Engineering, U.S. Department of Energy under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. Many thanks to Dr. Mike Miller for useful discussions and to Dr. Neal Evans for DigitalMicrograph custom scripts.Google Scholar