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J. Imaging 2018, 4(1), 5; doi:10.3390/jimaging4010005

In-Situ Imaging of Liquid Phase Separation in Molten Alloys Using Cold Neutrons

1
Materials Science and Engineering, University of California, Riverside, CA 92521, USA
2
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 7 December 2017 / Accepted: 7 December 2017 / Published: 25 December 2017
(This article belongs to the Special Issue Neutron Imaging)
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Abstract

Understanding the liquid phases and solidification behaviors of multicomponent alloy systems becomes difficult as modern engineering alloys grow more complex, especially with the discovery of high-entropy alloys (HEAs) in 2004. Information about their liquid state behavior is scarce, and potentially quite complex due to the presence of perhaps five or more elements in equimolar ratios. These alloys are showing promise as high strength materials, many composed of solid-solution phases containing equiatomic CoCrCu, which itself does not form a ternary solid solution. Instead, this compound solidifies into highly phase separated regions, and the liquid phase separation that occurs in the alloy also leads to phase separation in systems in which Co, Cr, and Cu are present. The present study demonstrates that in-situ neutron imaging of the liquid phase separation in CoCrCu can be observed. The neutron imaging of the solidification process may resolve questions about phase separation that occurs in these alloys and those that contain Cu. These results show that neutron imaging can be utilized as a characterization technique for solidification research with the potential for imaging the liquid phases of more complex alloys, such as the HEAs which have very little published data about their liquid phases. This imaging technique could potentially allow for observation of immiscible liquid phases becoming miscible at specific temperatures, which cannot be observed with ex-situ analysis of solidified structures. View Full-Text
Keywords: neutron imaging; in-situ imaging; alloys; phase separation; solidification; medium entropy alloys; high entropy alloys; multicomponent element alloys neutron imaging; in-situ imaging; alloys; phase separation; solidification; medium entropy alloys; high entropy alloys; multicomponent element alloys
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Derimow, N.A.; Santodonato, L.J.; Mills, R.; Abbaschian, R. In-Situ Imaging of Liquid Phase Separation in Molten Alloys Using Cold Neutrons. J. Imaging 2018, 4, 5.

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