(pdf) rapid solidification of non-stoichiometric intermetallic compounds: modeling and experimental verification
for undercooled Co-53at.%Si and Co-55at.%Si alloys, solute
drag was concluded to be significant upon rapid solidifica-
tion of non-stoichiometric intermetallic compounds. Solute
drag is significant over the entire range of undercooling
except for the late stage of the second sluggish stagewhere
complete solute trapping happens and the early stage of the
second abrupt growth stage where invert partitioning
occurs.
Acknowledgements
The authors would like to thank theNatural Science Foundation
of China (Nos. 51371149 and 51671075), the Huo Yingdong Young
Teacher Fund (No. 151048), theAeronauticalScienceFoundation of
China (No. 2021ZF53066), and the Free Research Fund of State Key
Lab. of Solidification Processing (No. 92-QZ-2021).
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(pdf) time-resolved in situ measurements during rapid alloy solidification: experimental insight for additive manufacturing
consequence of heat extraction due to variations in
the local curvature of the solid–liquid interface. In
both alloys, after an initial incubation time of
several microseconds, a columnar microstructure
developed during acceleration of the solid–liquid
interface. In the Al–Si alloy, columnar growth of
supersaturated primary a-Al phase persisted to the
end of the rapid solidification process. In the Al–Cu
alloy, columnar growth of a non-equilibrium eutec-
tic solidification product proceeded to the point of
absolute stability at the solid–liquid interface,
where a banded morphology common to many
rapidly solidified alloys developed. In situ imaging
provided the first direct observations of the evolu-
tion of this banded microstructure at this instability
point.
These types of in situ measurements have broad
implications for additive manufacturing through
integration with predictive modeling capabilities.
The results can both inform and validate models
with the goal of understanding processing–mi-
crostructure–properties/performance relationships
in additive manufacturing and non-equilibrium
materials processing.
ACKNOWLEDGEMENTS
This work was performed under the auspices of
the U.S. Department of Energy, by Lawrence
Livermore National Laboratory (LLNL) under
Contract No. DE-AC52-07NA27344. Activities and
personnel at LLNL were supported by the U.S.
Department of Energy, Office of Science, Office of
Basic Energy Sciences, Division of Materials Sci-
ence and Engineering under FWP SCW0974.
Activities and personnel at the University of Pitts-
burgh received support from the National Science
Foundation, Division of Materials Research, Metals
& Metallic Nanostructures program through Grant
No. DMR 1105757. Work at Los Alamos National
Laboratory (LANL) was performed under the aus-
pices of the U.S. Department of Energy by Los
Alamos National Security, LLC, under Contract No.
DE-AC52-06NA25396. Activities and personnel at
LANL were supported by AJC’s Early Career Award
from the U.S. Department of Energy, Office of Sci-
ence, Office of Basic Energy Sciences, Division of
Materials Science and Engineering. DTEM sample
preparation at LANL was performed at the Center
for Integrated Nanotechnologies, an Office of Sci-
ence User Facility operated for the U.S. Department
of Energy, Office of Science.
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998
Rapid solidification processing | request pdf
This book has developed the subject of solidification kinetics and interfacial processes at crystal-melt interfaces by considering near-equilibrium phenomena occurring over a few layers of atoms, some temporally associated with the crystal, and some temporally associated with the melt. This thin microscopic zone of transition was usually approximated mathematically as a ‘sharp’ interface of zero thickness. Also, the rate-limiting kinetic processes that were considered thus far acted both separately and simultaneously, and consisted of heat conduction and solute diffusion. Both of these transport mechanisms normally develop fields over macroscopic distances, as compared to the near-atomic interface thickness. Moreover, the dynamic interchanges among the host and solute atoms at sharp interfaces were considered to occur rapidly enough, and to repeat frequently enough, to approximate closely the condition of local interfacial thermodynamic equilibrium. Global, i.e. total, thermodynamic equilibrium, was shown to be inoperative, as it is precluded for virtually all crystal-melt processes on the basis that the relevant length scales over which heat transfer and solute diffusion operate on practical time scales for the motion of the interface are much too small to allow total equilibrium to be achieved.
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