The effect of Ag additions on the microstructure of aluminium-lithium alloys

Minor quantities of Ag have been added to Al–Li–Cu–Mg–Zr alloys. Their microstructure has been studied by means of optical metallography, transmission electron microscopy and X-ray diffraction. In the high Li, low Cu : Mg ratio alloys the main phases found were δ′, β′, S′ and T1, while fewer T2 and...

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Bibliographic Details
Published in:Journal of materials science 1998-08, Vol.33 (15), p.4015-4020
Main Authors: BOUKOS, N, FLOUDA, E, PAPASTAIKOUDIS, C
Format: Article
Language:English
Subjects:
Aluminum base alloys
Aluminum-lithium alloys
Applied sciences
Chemical precipitation
Copper
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnesium base alloys
Materials science
Metallography
Metals. Metallurgy
Microstructure
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitates
Silver
Solidification
Transmission electron microscopy
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Summary:Minor quantities of Ag have been added to Al–Li–Cu–Mg–Zr alloys. Their microstructure has been studied by means of optical metallography, transmission electron microscopy and X-ray diffraction. In the high Li, low Cu : Mg ratio alloys the main phases found were δ′, β′, S′ and T1, while fewer T2 and Al7Cu2Fe precipitates were also observed. The addition of up to 0.5 wt% Ag diminishes the δ′ and T1 precipitates size. This is attributed to a small increase of Li solubility in the matrix. In the low Li, high Cu : Mg ratio alloy the addition of 0.2 wt % Ag resulted in the precipitation of Ω phase simultaneously with δ′, β′, S′ and T1 phases. Due to the low Li concentration an unusual growth of the δ′/β′ precipitates at the expense of the δ′ precipitates was also observed.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1004613216469