Journal Article

PUBDB-2023-07888

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png From unlikely pairings to functional nanocomposites: FeTi–Cu as a model system

Schweiger, L. (Corresponding author)Extern* ; Kiener, D. ; Burtscher, M. ; Schafler, E.Extern* ; Mori, G.Extern* ; Spieckermann, F.Extern* ; Eckert, J.Extern*

2023
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.mtadv.2023.100433  doi:10.3204/PUBDB-2023-07888

Abstract: In order to develop materials for energy storage, a bulk nanocomposite with a composition of FeTi-25 vol% Cu was prepared by high-pressure torsion, with FeTi as functional phase for hydrogen storage and Cu as ductile phase to improve the processability. Despite the use of such a highly ductile auxiliary phase, the processability remained challenging due to strain localization in the softer Cu. This behavior is most pronounced at room temperature, and no nanocomposites were formed. At elevated temperatures, the strong strain rate sensitivity of the flow stress of the nanocrystalline Cu facilitates the formation of a FeTi–Cu nanocomposite due to a self-reinforcing process. Nevertheless, fragmentation of FeTi is limited because the resulting massive strain hardening prevents controlled processing at temperatures <250 °C, and Cu-rich shear bands develop at temperatures >250 °C. Satisfactory microstructural homogeneity is only achieved at the highest deformation temperatures of 550 °C. Overall, this study highlights that for unlikely material pairings, as often required in the pursuit of superior functional materials, the mechanical behavior of the phases involved and their interplay remains critical and must be thoroughly investigated when aiming for controlled structural homogeneity of bulk nanomaterials.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20220565 EC (I-20220565-EC) (I-20220565-EC)
3. FS-Proposal: I-20211364 EC (I-20211364-EC) (I-20211364-EC)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)
2. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2023

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