Hostname: page-component-7479d7b7d-t6hkb Total loading time: 0 Render date: 2024-07-14T12:19:52.468Z Has data issue: false hasContentIssue false

Predicting the Benefits of Adding Ternary Elements to Al-Sc Alloys

Published online by Cambridge University Press:  26 February 2011

Darko Simonovic
Affiliation:, Delft University of Technology, Materials Sciene and Engineering, Mekelweg 2, Delft, 2628CD, Netherlands, +31 15 2782346
Marcel H. F. Sluiter
Affiliation:, Delft University of Technology, Materials Science and Engineering, Mekelweg 2, Delft, 2628 CD, Netherlands
Get access


We seek to explain 1) the effectiveness of substituting Sc with Dy, Er, Y and 2) the loss of properties when Sc is replaced with Yb, Gd and Sm [1]. For a preliminary insight into the stability of structures we utilize the concept of Atomic Environment Type (AET) as pertaining to trialuminides. Electronic density functional total energy calculations at zero temperature are performed to obtain the enthalpy of mixing of quasi-binary Al-Sc-X structures. Estimates of the entropy are used to compute the stability regions of Al3Sc1-αXα L12 phase. We show that Sc is completely miscible with X=Dy, Er, Y and that there is a miscibility gap for X=Yb, Gd and Sm at temperatures near the aging temperature of Al-Sc alloys.


Research Article
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)



1. Karnesky, R.A., Dalen, M.E. van, Dunand, D.C., and Seidman, D.N., Scripta Mat. 55, 437440 (2006).Google Scholar
2. Toropova, L.S., Eskin, D.G., Kharakterova, M.L., and Dobatkina, T.V.: “Advanced Aluminum Alloys Containing Scandium”, (Gordon & Breach, London, 1998).Google Scholar
3. Røyset, J. and Ryum, N., International Materials Reviews 50, 1944 (2005).Google Scholar
4. Knipling, K.E., Dunand, D.C., and Seidman, D.N., Z. Metallkd. 97, 246265 (2006).Google Scholar
5. Braun, J. and Ellner, M., Metall Mater Trans A 32, 1037 (2001).Google Scholar
6. Kumar, K.S.: Int. Mater. Rev. 35, 293 (1990).Google Scholar
7. Villars, P., Cenzual, K., Daams, J.L.C., Hulliger, F., Massalski, T.B., Okamoto, H., Osaki, K., Prince, A., Iwata, S., Pauling File: Inorganic Materials Database and Design System, Binaries edn., (ASM International, Metal Park, OH, 2003).Google Scholar