Oxide-stabilized microstructure of severe plastically deformed CuCo alloys

journal article in Web of Science

English

Nanocrystalline materials are well known for their beneficial mechanical and physical properties. However, it is of utmost importance to stabilize the microstructure at elevated temperatures to broaden the window of application e.g. by pinning grain boundaries through impurities or oxides. CuCo alloys, severe plastically deformed using high-pressure torsion, were used to investigate the evolution of oxides upon annealing. These investigations were performed using electron microscopy, synchrotron high-energy X-ray scattering and atom probe tomography. Monitoring the evolution of oxides by in-situ small angle scattering investigations indicates the growth of primary oxides as well as the formation of another species of oxide at elevated temperatures. Slightly different coarsening can be observed in heat-treated samples, which can be traced back to the influence of different oxide amounts. The initially supersaturated CuCo matrix changes by the decomposition process as well as Co-and Cu-based oxides formation and growth. It has been found that the major number of oxides which are present after annealing, can already be found in the starting materials. (c) 2022 The Author(s). Published by Elsevier B.V. CC_BY_NC_ND_4.0

Severe plastic deformation; High-pressure torsion; Supersaturation; Nanocrystalline material; Atom probe tomography; Small-angle X-ray scattering

Stückler, M.; Zálešák, J.; Müller, T.; Wurster, S.; Weissitsch, L.; Meier, M.; Felfer, P.; Gammer, C.; Pippan, R.; Bachmaier, A.

27. 2. 2022

ELSEVIER SCIENCE SA

LAUSANNE

0925-8388

Journal of Alloys and Compounds

901

1

Swiss Confederation

163616-1

163616-11

11

https://linkinghub.elsevier.com/retrieve/pii/S092583882200007X