Microstructure of Guinier-Preston zones in Al-Ag

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00129-2· OSTI ID:417831

Malik, A; Schoenfeld, B; Kostorz, G ^[1]; Pedersen, J S ^[2]

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1. Eidgenoessische Technische Hochschule, Zuerich (Switzerland). Inst. fuer Angewandte Physik
2. 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, Journal Name: Acta Materialia Journal Issue: 12 Vol. 44; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALUMINIUM BASE ALLOYS
CRYSTAL MODELS
GUINIER-PRESTON ZONES
MICROSTRUCTURE
MONOCRYSTALS
SILVER ALLOYS
SMALL ANGLE SCATTERING