Microstructural evolution and B2 ordering in a new CuPdAgRu alloy

Kuglstatter M, Karpstein N, Apeleo Zubiri B, Wu M, Fecher J, Spiecker E, Höppel HW, Göken M (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Scripta Materialia Elsevier

Book Volume: 272

Article Number: 117053

DOI: 10.1016/j.scriptamat.2025.117053

Abstract

Recently, it has been reported that the formation of B2 crystals in CuPdAgRu alloys leads to a notable increase in strength and conductivity. Here, we investigate the microstructural evolution associated with the formation of the ordered B2 phase: Correlative X-ray and electron diffraction analysis confirms the partial transformation of the initial fcc structure of the alloy into B2; the distribution of alloying elements within the latter phase is revealed by atomic-scale energy-dispersive X-ray spectroscopy. 4D-STEM virtual dark-field imaging uncovers a finely and homogeneously distributed B2 phase. High-resolution STEM imaging directly reveals few-nanometer thin plate-like regions of fcc remaining embedded coherently in the B2 matrix with a specific orientation relationship; these regions correlate with an enrichment of Ag and depletion of Cu, contributing to the large lattice misfit between both phases. These observations provide insights into microscopic-level structural changes and their possible influence on macroscopic properties of advanced functional alloys.

Authors with CRIS profile

Moritz Kuglstatter Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Nicolas Karpstein Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Benjamin Apeleo Zubiri Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Mingjian Wu Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Heraeus Precious Metals GmbH & Co. KG DE Germany (DE)

How to cite

APA:

Kuglstatter, M., Karpstein, N., Apeleo Zubiri, B., Wu, M., Fecher, J., Spiecker, E.,... Göken, M. (2026). Microstructural evolution and B2 ordering in a new CuPdAgRu alloy. Scripta Materialia, 272. https://doi.org/10.1016/j.scriptamat.2025.117053

MLA:

Kuglstatter, Moritz, et al. "Microstructural evolution and B2 ordering in a new CuPdAgRu alloy." Scripta Materialia 272 (2026).

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