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Anisotropic Grain Growth in Iron-Carbon Films at High Electric Current Densities

10 Pages Posted: 31 Jul 2019 First Look: Under Review

See all articles by Thomas Brede

Thomas Brede

University of Goettingen (Gottingen) - Institute of Materials Physics

Reiner Kirchheim

University of Goettingen (Gottingen) - Institute of Materials Physics

Cynthia Volkert

University of Goettingen (Gottingen) - Institute of Materials Physics

Abstract

We investigate the effect of direct electric current (DC) on grain growth in 110 nm thick iron-carbon films with carbon concentrations at 2.7 at%. The application of DC-current during annealing at 550°C confirms the expected transport of carbon in the direction of the electric current and the unexpected formation of elongated, abnormally large carbide and ferrite grains along the current direction in the carbon-rich regions. The formation of elongated grains is explained by electromigration-induced carbon flux divergences that result from the carbide precipitates. This presents a possible scenario for controlling microstructure evolution in iron by using DC electric currents.

Keywords: thin films, electromigration processing, abnormal grain growth, iron-carbon, electron microscopy

Suggested Citation

Brede, Thomas and Kirchheim, Reiner and Volkert, Cynthia, Anisotropic Grain Growth in Iron-Carbon Films at High Electric Current Densities (July 27, 2019). Available at SSRN: https://ssrn.com/abstract=3427487

Thomas Brede (Contact Author)

University of Goettingen (Gottingen) - Institute of Materials Physics ( email )

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

Reiner Kirchheim

University of Goettingen (Gottingen) - Institute of Materials Physics

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

Cynthia Volkert

University of Goettingen (Gottingen) - Institute of Materials Physics

Platz der Gottinger Sieben 3
Gottingen, D-37073
Germany

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