The precipitation sequence in Al-Mg-Si alloys

Journal Article · Wed Jul 01 00:00:00 EDT 1998 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(98)00059-7· OSTI ID:644310

Edwards, G A; Dunlop, G L ^[1]; Stiller, K ^[2]; Couper, M J ^[3]

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1. Univ. of Queensland, Brisbane, Queensland (Australia)
2. Chalmers Univ. of Technology, Gothenburg (Sweden)
3. Comalco Research Centre, Thomastown, Victoria (Australia)

Fine-scale precipitation that occurs during age hardening of Al alloy 6061 has been studied using differential scanning calorimetry (DSC), atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). It was found that the precipitation sequence is: independent clusters of Mg and Si atoms {yields} co-clusters that contain Mg and Si atoms {yields} small precipitates of unknown structure {yields} {beta}{double_prime} needle-shaped precipitates {yields} B{prime} lath-shaped precipitates and {beta}{prime} rod-shaped precipitates. A new structure is proposed for the {beta}{double_prime} precipitate. It was found that the Mg:Si ratio in the intermediate precipitates and co-clusters was close to 1:1.

• OSTI ID: 644310
• Report Number(s): CONF-9704224--
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 11 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGE HARDENING
ALUMINIUM BASE ALLOYS
CALORIMETRY
CONCENTRATION RATIO
MICROSCOPY
MICROSTRUCTURE
PRECIPITATION