Metal–Matrix Composites from High-Pressure Torsion with Functionalized Material Behavior

Valeria Lemkova, Juraj Todt, Christian Motz, Florian Schaefer

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


In composites, outstanding properties of two materials can be combined. Inparticular, metal–matrix composites (MMCs) can combine the properties of ahigh-strength ductile metallic matrix with special properties of embeddedceramic particles. This hybrid can be used to create a functional material.However, during consolidation, the thermal load of most common MMC-processing routes is an obstacle for such functionalization, because the uniqueproperties of the ceramic phases most likely degrade. Mechanical alloying, in thiscase, by high-pressure torsion (HPT), can overcome this challenge. Herein, theattempt to obtain smart materials through HPT processing is aimed. For thatpurpose, Cu-MMCs are produced from mixed powders with ZrO2and BaTiO3(BTO) with the challenge to incorporate their functional phase. BTO can providea sensing ability for internal stress and ZrO2can provide a fatigue lifetime by aretarded crack growth. The amount of the stabilized phase is evaluated by X-raydiffraction. Cu–BTO–MMCs exhibit a local piezoelectric effect when strained,shown by in situ scanning Kelvin probe force microscopy. Cu–ZrO2–MMCsfeature a retarded fatigue crack initiation and an earlier crack closure duringfatigue crack growth due to the volume expansion once ZrO2transforms.
FachzeitschriftAdvanced Engineering Materials
PublikationsstatusVeröffentlicht - Okt. 2023

Bibliographische Notiz

Funding Information:
The authors thank Assoc. Prof. Dr. Daniel Kiener, Prof. Dr. Jozef Keckes, Dr. Anton Hohenwarter, and Peter Kutleša from Erich Schmid Institute of Materials Science (ESI) of the Austrian Academy of Sciences for their support during synthesis, HPT, and phase analysis via XRD. The authors are indebted to Prof. Dr. Karen Lienkamp from Saarland University and Maria Zober form Freiburg Center for Interactive Materials and Bioinspired Technologies (FIT) for the possibility to perform SKPFM measurements and their support. Thanks to Dominik Perius and Prof. Dr. Tobias Kraus for the LUMiSizer measurements. Open Access funding enabled and organized by Projekt DEAL.

Publisher Copyright:
© 2023 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH.

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