Microstructure of Guinier-Preston zones in Al-Ag
- Eidgenoessische Technische Hochschule, Zuerich (Switzerland). Inst. fuer Angewandte Physik
- Risoe National Lab., Roskilde (Denmark). Dept. of Solid State Physics
An Al-3 at.% Ag single crystal aged for 4 h at 413 K to produce Guinier-Preston zones ({eta}-zones) was investigated by diffuse wide-angle X-ray and small-angle neutron scattering. Based on the separated short-range order scattering, model crystals were generated. The zones in the model crystal have an average Ag concentration of (80 {+-} 10) at.% Ag. The same result is obtained by applying the same procedure to a previously measured state with {epsilon}-zones (Al-3 at.% Ag aged at 453 K for 4 min). For both types of zone, Ag concentrations range from (70--75) at.% in the core to (85--90) at.% in the shell. No signs of long-range order are detected within the {epsilon}- and {eta}-zones. Thus, a distinction (suggested by previous investigators) of two different states for Guinier-Preston zones in Al-Ag seems no longer compelling.
- OSTI ID:
- 417831
- Journal Information:
- Acta Materialia, Vol. 44, Issue 12; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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