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Modification of the Diffusion Process in the Iron-Aluminum System via Spark Plasma Sintering/Field Assisted Sintering Technology
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Modification of the Diffusion Process in the Iron-Aluminum System via Spark Plasma Sintering/Field Assisted Sintering Technology

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Abstract:

The influence of Spark Plasma Sintering / Field Assisted Sintering Technology applying pulsed direct current up to the root-mean-square current densities of 129 A/cm2 on the interfacial reactions in Al - Fe - Al stacks was investigated at temperatures between 500°C and 600°C. Independently of the current density and current direction, thin Al13Fe4 and wide Al5Fe2 phases were detected in the diffusion couples. The Al5Fe2 phase consisted of columnar grains having a {001}-fiber texture. Al13Fe4 was found in the form of discontinuous spots at the Al/Al5Fe2 interface. The interface between Al5Fe2 and Fe was highly fringed. The layer growth kinetics of Al5Fe2 was parabolic. The growth rate was strongly enhanced in the SPS/FAST experiments as compared to the conventional diffusion experiments, independently, on the current direction. It is suggested that the enhanced growth rates are a result of temperature gradients existing in a typical Spark Plasma Sintering device. Possible effects of thermomigration and electromigration are discussed.

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Periodical:

Defect and Diffusion Forum (Volume 367)

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1-9

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.367.1

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Online since:

April 2016

Authors:

Hanka Becker, D. Heger, Andreas Leineweber, David Rafaja

Keywords:

Diffusion, Intermetallics, Iron Aluminide, Kinetics, SPS/FAST

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