Journal article

Publication year: 2023

Journal: Acta Materialia

Volume number: 261

ISSN: 1359-6454

eISSN: 1873-2453

Open access status: Hybrid

DOI Link: https://doi.org/10.1016/j.actamat.2023.119345

Publisher: Elsevier

Abstract: 
In the present work, we study the evolution of metastable and Cu-containing precursor precipitates into stable beta-Mg2Si using in-situ transmission electron microscopy during continuous heating of an AA6061 aluminum alloy. The experiments indicate that the transformation into stable beta-Mg2Si involves the release of Al and Cu atoms into the matrix phase combined with the rearrangement of Mg and Si at the interfaces. Nucleation of the beta-Mg2Si precipitates predominantly occurs at the interface between the precursors and the aluminum matrix and at dispersoids. The term precipitate-related transformation is used to emphasize the reaction mechanism, where a new product precipitate nucleates next to a precursor and consumes it at its original location predominantly via interface diffusion. The in-situ investigations are complemented by an analysis of bulk samples and a comparison with differential scanning calorimetry measurements, which show excellent agreement.

Harvard Citation style: Kahlenberg, R., Wojcik, T., Falkinger, G., Krejci, A., Milkereit, B. and Kozeschnik, E. (2023) On the precipitation mechanisms of β-Mg₂Si during continuous heating of AA6061, Acta Materialia, 261, Article 119345. https://doi.org/10.1016/j.actamat.2023.119345

APA Citation style: Kahlenberg, R., Wojcik, T., Falkinger, G., Krejci, A., Milkereit, B., & Kozeschnik, E. (2023). On the precipitation mechanisms of β-Mg₂Si during continuous heating of AA6061. Acta Materialia. 261, Article 119345. https://doi.org/10.1016/j.actamat.2023.119345