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Effect of Current Pathways During Spark Plasma Sintering of an Aluminum Alloy Powder

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Abstract

Spark plasma sintering has been a well-studied processing technique primarily for its very high cooling and heating rates. However, the underlying phenomenon driving the sintering behavior of powders under an electric field is still poorly understood. In this study, we look at the effect of changing current pathways through the powder bed by changing die materials, from conductive graphite to insulating boron nitride for sintering aluminum alloy 5083 powder. We found that the aluminum powder itself was insulating and that by changing the current paths, we had to find alternate processing methods to initiate sintering. Altering the current pathways led to faster temperature raises and faster melting (and potentially densification) of the aluminum powder. A flash sintering effect in metallic powders is observed in which the powder compact undergoes a rapid transition from electrically insulating to conducting at a temperature of 583 K (310 °C).

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Authors and Affiliations

  1. Bowhead Science and Technology, Belcamp, MD, 21017, USA

    Frank Kellogg

  2. U.S. Army Research Laboratory, Weapons & Materials Research Directorate, Aberdeen Proving Ground, MD, 21005, USA

    Brandon McWilliams & Kyu Cho

Authors
  1. Frank Kellogg
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  2. Brandon McWilliams
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  3. Kyu Cho
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Correspondence to Frank Kellogg.

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Manuscript submitted June 9, 2016.

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Kellogg, F., McWilliams, B. & Cho, K. Effect of Current Pathways During Spark Plasma Sintering of an Aluminum Alloy Powder. Metall Mater Trans A 47, 6353–6367 (2016). https://doi.org/10.1007/s11661-016-3803-1

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