| Record |
| Title |
Fuller, Christian B.; Seidman, David N. |
Year |
Temporal Evolution of the Nanostructure of Al(Sc,Zr) Alloys: Part II—Coarsening of Al[sub:3]Sc[sub:1-x]Zr[sub:x] Precipitates |
Abbreviated Journal |
Journal Article |
| Issue |
2005 |
Keywords |
Acta Materialia |
| Address |
Acta Mater. |
| Thesis |
53 |
| Place of Publication |
20 |
Language |
5415-5428 |
Original Title |
Al-Sc-Zr; Phase Transformations; nanostructure; Transmission electron microscopy (TEM), |
| Series Title |
The coarsening behavior of four Al(Sc,Zr) alloys containing small volume fractions (< 0.01) of
Al3(Sc1-xZrx) (L12) precipitates was investigated employing conventional transmission electron
microscopy (CTEM) and high-resolution electron microscopy (HREM). The activation energies for
diffusion-limited coarsening were obtained employing the Umantsev-Olson-Kuehmann-Voorhees
(UOKV) model for multi-component alloys. The addition of Zr is shown to retard significantly the
coarsening rate and stabilize precipitate morphologies. HREM of Al(Sc,Zr) alloys aged at 300C
reveals Al3(Sc1-xZrx) precipitates with sharp facets parallel to {100} and {110} planes. Coarsening of
Al-0.07 Sc-0.019 Zr at.%, Al-0.06 Sc-0.005 Zr at.%. and Al-0.09 Sc-0.047 Zr at.% alloys is shown to be
controlled by volume diffusion of Zr atoms, while coarsening of Al-0.14 Sc-0.012 Zr et al. is controlled
by volume diffusion of Sc atoms. |
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