| Numéro |
J. Phys. Colloques
Volume 48, Numéro C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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| Page(s) | C6-337 - C6-342 | |
| DOI | https://doi.org/10.1051/jphyscol:1987655 | |
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-337-C6-342
DOI: 10.1051/jphyscol:1987655
1 Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
2 The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku 106, Japan
3 Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, U.S.A.
J. Phys. Colloques 48 (1987) C6-337-C6-342
DOI: 10.1051/jphyscol:1987655
PRECIPITATION PROCESS OF Al-Sc ALLOYS
N. Sano1, Y. Hasegawa2, K. Hono3, H. Jo1, K. Hirano1, H.W. Pickering3 et T. Sakurai21 Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai 980, Japan
2 The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku 106, Japan
3 Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, U.S.A.
Abstract
Precipitation process in an Al-0.25 wt.%Sc alloy aged at 573 K has been investigated by resistivity and hardness measurements, transmission electron microscopy, and atom-probe field ion microscopy. It was found that the equilibrium Al3Sc phase particles precipitate homogeneously from the begining. The particles coarsen following the Lifschitz-Wagner rule after the completion of the nucleation-and-growth stage. Although the precipitation process seemed to be simple, the composition of the precipitate varied with aging time in an unexpected way. The content of the precipitate was measured to be 27 at.%Sc in the initial stage of aging, and increased to 35 at.%Sc.