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New Developments in Extrusion of 2xxx Alloys with Solution Heat Treatment

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New Developments in Extrusion of 2xxx Alloys with Solution Heat
Treatment on the Press

Dariusz Lesniak, Jozef Zasadzinski, Marek Galanty, Antoni Woznicki, and Artur Rekas,
AGH University of Science and Technology, Kraków, Poland


ABSTRACT—In the work, extrusion trials of high-strength aluminum alloys 2014 and 2024,
with solution heat treatment on the press were performed. The study describes microstructures
and mechanical properties of extrudates, including dependence on alloy chemical composition,
mode of homogenization treatment, and extrusion temperature-speed conditions. The optical
microscopy and SEM/EDS characterization were supported by DSC analysis, enabling the
determination of solidus temperatures of the analyzed alloys. The extrudates surface quality and
extrusion force were also analyzed. Investigations revealed that minimized contents of the main
alloy additions of copper (Cu) and magnesium (Mg), high-temperature homogenization, and
increased extrusion temperatures contributed to achieving a high solutioning ratio of the alloys,
guaranteeing improved mechanical properties of extrudates. High-temperature homogenization
allowed achieving uniform microstructure of ingots with fine particles of intermetallic phases.
The significant increase in the solidus temperatures of the homogenized alloys was observed,
which made more effective solutioning possible on the run-out table. The increase in metal exit
speed and reduction of the extrusion force was stated, compared to conventional extrusion
technology. The proposed solutions will allow for industrial production of AlCuMg extrudates
with improved mechanical properties in the shortened technological cycle, with heat treatment on
the press.

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