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) | C6-349 - C6-354 | |
DOI | https://doi.org/10.1051/jphyscol:1987657 |
J. Phys. Colloques 48 (1987) C6-349-C6-354
DOI: 10.1051/jphyscol:1987657
ATOM-PROBE ANALYSIS OF G.P. ZONES IN AN Al-1.7 at % Cu ALLOY
K. Hono1, T. Sakurai2 et H.W. Pickering11 Department of Materials Science & Engineering, The Pennsylvania State University, University Park, PA 16802, U.S.A.
2 The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
Abstract
G.P. zones in an Al-1.7 at%Cu alloy aged a t 383 K for 8000 min were analyzed by atom probe FIM. The layer-by-layer concentration profiles in the <100> direction were obtained from several G.P. zones. Generally, the G.P. zones were found to consist of several copper enriched layers, the maximum composition of which was 50 at% in this aging condition. Although some uncertainty exists as to the copper content, it can be concluded that none of the copper enriched layers approach the pure copper concentration. Some G.P. zones showed two well separated copper enriched regions, others showed a broad single peak in copper concentration. Therefore, it was concluded that this aging stage is a transition from a G.P. 1 to a G.P. 2 stage. The present result together with the previous atom-probe data indicates that there is a distinct stage for G.P. 2 zones which have two separated copper enriched layers in the {200} planes.