Strengthening of Zn–22Al–2Cu alloy wire by artificial ageing

Changes in hardness, measured at room temperature, were detected after continuous artificial ageing at 250°C, for different periods, in a Zn–22Al–2Cu (wt.%) alloy wire. The presence of the ternary stable τ′ phase precipitate (Al 4Cu 3Zn) and the decomposition of the Zn-rich hcp metastable η T′ phase...

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Bibliographic Details
Published in:Materials letters 2000-04, Vol.43 (3), p.153-157
Main Authors: Hinojosa-Torres, J., Zhu, Y.H., Herrera-Vázquez, A., Castaño, V.M.
Format: Article
Language:English
Subjects:
Applied sciences
Artificial ageing
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Extrusion
Materials science
Metals. Metallurgy
Metastable
Phase transformation
Physics
Semicontinuous casting
Solid solution hardening, precipitation hardening, and dispersion hardening
aging
Solid solution, precipitation, and dispersion hardening
aging
Strengthening
Treatment of materials and its effects on microstructure and properties
Wiredrawing
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Summary:Changes in hardness, measured at room temperature, were detected after continuous artificial ageing at 250°C, for different periods, in a Zn–22Al–2Cu (wt.%) alloy wire. The presence of the ternary stable τ′ phase precipitate (Al 4Cu 3Zn) and the decomposition of the Zn-rich hcp metastable η T′ phase as a consequence of the ageing, are shown in this work. Then, X-ray diffraction showed that after 1 h of ageing the hcp η phase is present in the microstructure of the wire, this phase remaining stable along the heat treatment. The wire was prepared by rapid solidification by using the semicontinuous casting technique, followed by extrusion of the semicontinuous casting rods and, finally, wiredrawing of the extruded material.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(99)00249-9