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Changes in short- and medium-range order in metallic liquids during undercooling

Published online by Cambridge University Press:  10 November 2020

M.J. Kramer
Affiliation:
Materials Science and Engineering Division, US Department of Energy Ames Laboratory, USA; mjkramer@ameslab.gov
Mo Li
Affiliation:
Georgia Institute of Technology, USA; mo.li@mse.gatech.edu
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Abstract

It has been widely speculated that dominant motifs, such as short-range icosahedral order, can influence glass formation and the properties of glasses. Experimental data on both fragile and strong undercooled liquids show corresponding changes in their thermophysical properties consistent with increasing development of a network of interconnect motifs based on molecular dynamics. Describing these regions of local order, how they connect, and how they are related to property changes have been challenging issues, both computationally and experimentally. Yet the consensus is that metallic liquids develop interconnected medium-range order consisting of some regions with lower mobility with deeper undercooling. Less well understood is how these motifs (or “crystal genes”) in the liquid can inhibit nucleation in the deeply undercooled liquid or influence phase selection upon devitrification. These motifs tend to have local packing unlike stable compounds with icosahedral order tending to dominate the best glass formers. The underlying kinetic and thermodynamic forces that guide the formation of these motifs and how they interconnect during undercooling remain open questions.

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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