Abstract
An atom probe tomography characterization of the microstructure of as-processed and crept mechanically-alloyed, oxide-dispersion-strengthened (MA/ODS) ferritic alloys has been performed. The significant enrichments of Cr, W, Ti, Y, O, C and B in the vicinity of dislocations and the presence of ultrastable 4-nm-diameter Ti-, Y- and O-enriched particles appears to be responsible for their improved high temperature mechanical properties.
Original language | English |
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Pages (from-to) | 140-145 |
Number of pages | 6 |
Journal | Materials Science and Engineering: A |
Volume | 353 |
Issue number | 1-2 |
DOIs | |
State | Published - Jul 25 2003 |
Funding
The authors would like to thank Professor K. Miyahara of the Department of Molecular Design, Nagoya University, Nagoya, Japan and Dr J. Okuda, Kobe Special Tube Co. Ltd., Japan for the provision of the MA/ODS alloys used in this study and Dr I.-S. Kim, formerly at Nagoya University, Nagoya, Japan for his assistance in the creep tests. Research at the Oak Ridge National Laboratory SHaRE Collaborative Research Center was sponsored by the Laboratory Directed Research and Development Program and the Division of Materials Sciences and Engineering, US Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.
Keywords
- Atom probe
- Dislocation
- Mechanical alloying
- Microstructural characterization
- Precipitation
- Segregation