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Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification

Hauf, Ulla ; Kauffmann, Alexander ; Kauffmann-Weiss, Sandra ; Feilbach, Alexander ; Boening, Mike ; Mueller, Frank E. H. ; Hinrichsen, Volker ; Heilmaier, Martin (2024)
Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification.
In: Metals, 2017, 7 (11)
doi: 10.26083/tuprints-00016358
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification
Language: English
Date: 16 January 2024
Place of Publication: Darmstadt
Year of primary publication: 2017
Place of primary publication: Basel
Publisher: MDPI
Journal or Publication Title: Metals
Volume of the journal: 7
Issue Number: 11
Collation: 14 Seiten
DOI: 10.26083/tuprints-00016358
Corresponding Links:
Origin: Secondary publication DeepGreen

The formation of the surface-near microstructure after a current interruption of CuCr contact materials in a vacuum interrupter is characterized by a fast heating and subsequently rapid solidification process. In the present article, we reveal and analyse the formation of two distinct microstructural regions that result from the heat, which is generated and dissipated during interruption. In the topmost region, local and global texture, as well as the resulting microstructure, indicate that both Cu and Cr were melted during rapid heating and solidification whereas in the region underneath, only Cu was melted and elongated Cu-grains solidified with the <001>-direction perpendicularly aligned to the surface. By analysing the lattice parameter of the Cu solid solution, a supersaturation of the solid solution with about 2.25 at % Cr was found independent if Cu was melted solely or together with the Cr. The according reduction of electrical conductivity in the topmost region subsequent to current interruption and the resulting heat distribution are discussed based on these experimental results.

Uncontrolled Keywords: CuCr, supersaturation, solid solution, texture, powder metallurgy, microstructure, contact material, vacuum interrupter, heat affected volume
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-163587
Classification DDC: 500 Science and mathematics > 530 Physics
600 Technology, medicine, applied sciences > 621.3 Electrical engineering, electronics
600 Technology, medicine, applied sciences > 660 Chemical engineering
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electrical Power Systems > High Voltage Technology
Date Deposited: 16 Jan 2024 10:49
Last Modified: 02 Apr 2024 12:26
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/16358
PPN: 516711792
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