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Surface roughness and its structural orientation caused by internal microstructural changes in mechanically stressed copper conductors

  • In this paper, the mechanical damage behavior is investigated based on the characteristic roughness on the surface and the orientation of superficial structures. The main goal is to explore the surface roughness on mechanically loaded copper conductors as a lifetime indicator. For this purpose, copper conductors are mechanically stressed in accordance with EN 50,396 and then examined metallographically and microscopically. The microstructure examination shows that the roughness is caused by material extrusion and cracks due to work hardening in the surface area. Using confocal microscopy, it is shown for the first time that significant formation of surface roughness takes place over the service life of copper conductors. The roughness increases monotonically, but not linearly with number of cycles, due to internal microstructural processes and can be divided into three sections. First inspections of the conductor surface over lifetime show a correlation between the intensity of structures orientated 45° to the loading direction and the roughness. This phenomenon, already known from microscopic slip lines, is thus also evident in macroscopic roughness formation and is well founded by the research theory on material extrusion along dislocation lines. In summary, a lifetime determination is possible based on its developing roughness which enables the utilization as a sensor element.

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Metadaten
Verfasserangaben:Philipp BaronORCiD, Philipp LenzORCiD, Maria Schomer, Klaus P. KochORCiD, Armin WittmannORCiD, Georg Fischer
URN:urn:nbn:de:hbz:tr5-1503
DOI:https://doi.org/10.1007/s10853-022-07579-w
Titel des übergeordneten Werkes (Englisch):Journal of Materials Science
Verlag:Springer
Dokumentart:Wissenschaftlicher Artikel (Fachzeitschriften)
Sprache:Englisch
Datum des OPUS-Uploads:27.09.2022
Datum der Erstveröffentlichung:13.08.2022
Veröffentlichende Hochschule:Hochschule Trier
Datum der Freischaltung:27.09.2022
Freies Schlagwort / Tag:confocal microscopy; copper conductors; material extrusion; surface roughness
GND-Schlagwort:Rauigkeit; Elektrischer Leiter; Kupfer; Konfokale Mikroskopie
Jahrgang:57
Ausgabe / Heft:32
Seitenzahl:11
Erste Seite:15549
Letzte Seite:15559
Einrichtungen:FB Technik
DDC-Klassifikation:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik
Lizenz (Deutsch):License LogoCreative Commons - CC BY - Namensnennung 4.0 International