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Study on dissolution of Al2Cu in al-4.3cu and a205 cast alloys
Jönköping University, Sweden.
Jönköping University, Sweden.
Scania CV AB, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-4005-812X
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2020 (English)In: Metals, ISSN 2075-4701, Vol. 10, no 7, article id 900Article in journal (Refereed) Published
Abstract [en]

Evolution of microstructure in a binary Al-Cu system (Al-4.3Cu) and a commercially alloyed Al-Cu system (A205) during solution heat treatment was investigated using optical microscopy (OM), scanning electron microscopy (SEM), wavelength-dispersive X-ray spectroscopy (WDS), and differential scanning calorimetry (DSC). The diversified coarseness of the microstructure was initiated by controlling the solidification rate. Different solution treatment temperatures were applied to identify a proper solutioning temperature. The larger microstructural scale required an increased solutioning temperature and prolonged holding time to obtain homogenized solutes in the α-Al matrix. The diffusion of Cu primarily controlled the solution heat treatment process. A diffusion-based model was applied and calibrated to determine the dissolution rate of an Al2Cu particle in the matrix. The model operates on a similar time scale with the experimental results for the Al-4.3Cu and A205 alloys with various microstructural scales, different chemical compositions, and at different solution treatment temperatures. Three-dimensional (3D) reconstructed images from SEM images and energy dispersive spectroscopy (EDS) map of elements showed that TiB2 particles shield the Cu-rich phases in the boundaries of α-Al grains, presumably acting as a physical barrier to the diffusion of Cu solutes toward α-Al grains. The model also suggests that the effective diffusion coefficient of Cu in Al, in the presence of TiB2 particles, reduced by a factor of 2.0–2.5 in the A205 alloy compared with the binary Al-Cu alloy. © 2020 by the authors.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 10, no 7, article id 900
Keywords [en]
A205, Al-Cu alloy, Diffusion-based model, Solution heat treatment, TiB2 particles
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45616DOI: 10.3390/met10070900Scopus ID: 2-s2.0-85088685842OAI: oai:DiVA.org:ri-45616DiVA, id: diva2:1458201
Note

Funding details: Energimyndigheten, 2016-04330, 2016-04330, 2016-04330, 2016-04330; Funding text 1: Funding: This works was funded by SIP Lättvikt, a collaboration between Vinnova, Formas, and the Swedish Energy Agency, grant number 2016-04330, within the context of EXTREME project.; Funding text 2: Acknowledgment: This works was funded by SIP Lättvikt, a collaboration between Vinnova, Formas, and the Swedish Energy Agency, grant number 2016-04330, within the context of EXTREME project. GKN Aerospace and RISE are acknowledged for technical and advisory support. AEROMET is acknowledged for providing the materials.

Available from: 2020-08-14 Created: 2020-08-14 Last updated: 2023-05-09Bibliographically approved

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Bjurenstedt, Anton

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