Nature and distribution of quench-induced precipitation in an Al-Zn-Mg-Cu alloy

Journal Article · Tue Nov 03 04:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00357-1· OSTI ID:289470

Deschamps, A; Brechet, Y ^[1]

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1. Domaine Univ. de Grenoble, St. Martin d`Heres (France)

Quench sensitivity of 7000 series aluminium alloys (Al-Zn-Mg (Cu)) is a major concern in the aerospace industry, where the growing tendency towards the production of thick plates and the desire for reducing quench-induced internal stresses result in relatively slow cooling rates at the plate midplanes during the quench following the solution treatment. During a slow quench, extensive nucleation of precipitates may occur on chromium or zirconium-containing dispersoids, resulting in a decrease of the solute available for fine-scale precipitation and therefore a reduction in the hardening potential. The nature and distribution of this precipitation has been thoroughly investigated in the ternary 7000 alloys (Al-Zn-Mg); it has been shown that it consisted mostly of {eta}{sub 2} precipitates nucleated on Al{sub 3}Zr dispersoids. This contribution aims at investigating the nature and distribution of quench-induced precipitates in a Cu-containing alloy suitable for aerospace applications.

• OSTI ID: 289470
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 11 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
INTERMETALLIC COMPOUNDS
MAGNESIUM ALLOYS
MICROHARDNESS
MICROSTRUCTURE
PRECIPITATION
QUENCHING
SPATIAL DISTRIBUTION
ZINC ALLOYS