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Imaging transient solidification behavior

Published online by Cambridge University Press:  10 November 2020

Joseph T. McKeown
Affiliation:
Materials Science Division, Lawrence Livermore National Laboratory, USA; mckeown3@llnl.gov
Amy J. Clarke
Affiliation:
Department of Metallurgical and Materials Engineering, Colorado School of Mines, USA; amyclarke@mines.edu
Jörg M.K. Wiezorek
Affiliation:
Department of Mechanical Engineering and Materials Science, University of Pittsburgh, USA; wiezorek@pitt.edu
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Abstract

Solidification processing offers the first opportunity to control microstructure, properties, and performance in metallic alloy components. Until recently, microstructural evaluations were limited to post-solidification characterization by destructive methods. We review the development of time-resolved, in situ imaging techniques capable of capturing solid–liquid interfacial evolution in metallic alloys with high spatial and temporal resolution under diverse solidification conditions relevant for applications ranging from conventional directional solidification, crystal growth, and casting, to welding and additive manufacturing. These experiments enable direct visualization of transient behaviors that would otherwise remain unknown, uniquely providing insights into the physics that impact microstructure and defect development, and strategies for microstructural control and defect mitigation. Understanding microstructural evolution and the characteristics that form under various solidification conditions is essential for the development of multiscale, experimentally informed predictive modeling. This is highlighted by solidification simulations that utilize in situ measurements of solidification dynamics from state-of-the-art experimental techniques.

Information

Type
Processing Metallic Materials Far from Equilibrium
Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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