| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10634212 | Scripta Materialia | 2005 | 5 Pages |
Abstract
An unusual precipitate structure in ternary Al(Sc,Zr) alloys has been revealed by analytical and high resolution transmission electron microscopy. Coherent precipitates with L12 structure and highly anisotropic shapes were found to consist of a core containing Al and Sc surrounded by a Zr-rich shell. The shell thickness ranged from about 4 to 7Â nm in different particles. An abrupt change in composition between core and shell was indicated by both, energy-dispersive X-ray microanalysis and high resolution phase contrast imaging. It is likely that this phenomenon is responsible for the increased resistance to coarsening of Al3(Sc,Zr) precipitates in these ternary alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A. Tolley, V. Radmilovic, U. Dahmen,