Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 470, Issue 1-2, Pages 107-110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.02.043
Keywords
Core-shell; Dispersoids; Al-Zr-Sc; Diffusion; Ramp; Heating; Dispersoid
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Funding
- Hydro Aluminium
- Elkem ASA
- Norwegian Research Council [143877/213]
- NTNU
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The non-isothermal formation of Sc- and Zr-containing dispersoids in Al-Zr-Sc ternary alloys has been investigated by atom probe tomography (APT). In the early stages of precipitation, a high number density of Sc-rich clusters form. These clusters subsequently transform into Al3Sc particles with a L1(2) structure. When Zr diffusion becomes significant, Zr atoms are found to segregate to Al3Sc/alpha-Al matrix interfaces. Further annealing at 748 K gives rise to a duplex core/shell structure. (C) 2008 Elsevier B.V. All rights reserved.
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