Precipitation and dissolution kinetics in Al-Li-Cu-Mg alloy 8090

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90009-H· OSTI ID:6052648

Luo, A; Youdelis, W V ^[1]; Lloyd, D J; Gupta, A ^[2]

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1. Univ. of Windsor, Ontario (Canada). Dept. of Mechanical Engineering
2. Alcan International, Kingston, Ontario (Canada)

Resistivity and differential scanning calorimetry (DSC) techniques are used to study the kinetics of precipitation and dissolution of GPB zones and metastable phases ([delta][prime] and S[prime]) in Al-Li-Cu-Mg alloy 8090. Three stages of the precipitation sequence during aging have been analyzed. A new analytical method is developed for the DSC technique, which requires only one heating rate to obtain the kinetic parameters, and the results show good agreement with the more conventional method of varying heating rate. The low-temperature endothermic peak in the DSC thermogram is interpreted as the dissolution of Li-bearing zones, which is supported by the hardness results. The activation energy, Q, and the growth parameter, n, determined by resistivity and DSC techniques are in good agreement with previously published data.

• OSTI ID: 6052648
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:3; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MICROSTRUCTURE
COPPER ALLOYS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
AGING
CALORIMETRY
DISSOLUTION
ELECTRIC CONDUCTIVITY
KINETICS
PHASE STUDIES
PRECIPITATION
QUATERNARY ALLOY SYSTEMS
ALLOY SYSTEMS
ALLOYS
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
SEPARATION PROCESSES
360102* - Metals & Alloys- Structure & Phase Studies