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Critical Undercooling in DNA-Mediated Nanoparticle Crystallization
ACS Nano, 2016 The nucleation of DNA-functionalized nanoparticle superlattices is observed to exhibit a temperature hysteresis between melting (superlattice dissociation) and freezing (particle association) transitions that allows for the study of nucleation ...
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Metallurgical Transactions A, 1987
An important parameter affecting microstructure development during solidification is the amount of undercooling prior to nucleation. The undercooling potential of aluminum has been assessed by thermal analysis measurements on powder dispersions of the liquid metal. A number of variables have been identified which influence the undercooling of powder Al
B. A. Mueller, J. H. Perepezko
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An important parameter affecting microstructure development during solidification is the amount of undercooling prior to nucleation. The undercooling potential of aluminum has been assessed by thermal analysis measurements on powder dispersions of the liquid metal. A number of variables have been identified which influence the undercooling of powder Al
B. A. Mueller, J. H. Perepezko
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Materials Science and Technology, 2017
The critical undercoolings for the two grain refinement events and the onset of recrystallisation event are determined by detailed analysis of the microstructure evolution of bulk undercooled Ni–20 at.-%Cu alloy melts. The first grain refinement event occurred in the low undercooling range was explained by dendrite remelting.
Xiao Long Xu, Hua Hou, Feng Liu
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The critical undercoolings for the two grain refinement events and the onset of recrystallisation event are determined by detailed analysis of the microstructure evolution of bulk undercooled Ni–20 at.-%Cu alloy melts. The first grain refinement event occurred in the low undercooling range was explained by dendrite remelting.
Xiao Long Xu, Hua Hou, Feng Liu
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Dendrites in the Small Undercooling Limit
Studies in Applied Mathematics, 1986Dendrites of a solid growing steadily in an undercooled melt have a shape given by the solution of certain nonlinear integrodifferential equations. If one does not take account of the Gibbs‐Thomson condition, these equations have an exact solution due to Ivantsov and to Cahn and Horway.
Pelce, P., Pomeau, Y.
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Scientific American, 1965
The formation by melt quenching of such metastable structures as glassy or microcrystalline solids and highly supersaturated solutions is made possible by the extreme resistance of most melts to homophase crystal nucleation at deep undercooling. This nucleation resistance contrasts sharply with the very low kinetic resistance to the movement of crystal-
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The formation by melt quenching of such metastable structures as glassy or microcrystalline solids and highly supersaturated solutions is made possible by the extreme resistance of most melts to homophase crystal nucleation at deep undercooling. This nucleation resistance contrasts sharply with the very low kinetic resistance to the movement of crystal-
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Grain refinement and growth instability in undercooled alloys at low undercooling
Journal of Applied Physics, 1998In a previous paper [J. Appl. Phys. 82, 3783 (1997)] we presented an analysis of the stability of a dendrite against a small perturbation to the tip velocity. This model demonstrated that dendritic growth in pure metals and alloys would become unstable above some upper critical undercooling ΔT2*, while in alloys above a critical concentration ...
A. M. Mullis, R. F. Cochrane
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Crystallization of Polyethylene at Large Undercooling
ACS Macro Letters, 2016Extremely fast crystallization of high-density polyethylene and random copolymers of ethylene with up to 16 mol % 1-octene was observed for the first time by ultrafast scanning calorimetry. In order to account for the inherently high crystallization rate of polyethylenes, in nonisothermal and isothermal crystallization experiments cooling rates up to 1
Evgeny, Zhuravlev +4 more
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1986
Nucleation plays an important role in many processes involving phase changes, such as boiling, condensation, cloud formation, solidification, defect formation etc. Even though it is not invoked in the formation of a-morphous solid phases, nucleation dynamics is an essential ingredient into our understanding of glassy solidification.
D. M. Herlach, B. Feuerbacher
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Nucleation plays an important role in many processes involving phase changes, such as boiling, condensation, cloud formation, solidification, defect formation etc. Even though it is not invoked in the formation of a-morphous solid phases, nucleation dynamics is an essential ingredient into our understanding of glassy solidification.
D. M. Herlach, B. Feuerbacher
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Solidification from undercooled melts
Materials Science and Engineering: A, 1997Techniques of containerless processing are applied to undercool and solidify metals and alloys. These techniques allow direct measurements of both the undercooling and the crystal growth velocity. Experimental results are presented for studies of nucleation of quasicrystalline and metastable crystalline phases.
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