Crystallization of a faceted primary phase in a stirred slurry

Smith, David M.; Eady, J.A.; Hogan, L.M.; Irwin, D. W.

doi:10.1007/bf02656825

Cited by 21 publications

(5 citation statements)

References 8 publications

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“…Although nucleation and crystal growth in the magma ocean might seem to be very difficult to constrain, fortunately, this process is mathematically very similar to bulk crystallization of continuously cooling liquids in laboratory conditions (Lofgren et al, 1974;Flemings et al, 1976;Grove and Walker, 1977;Walker et al, 1978;Ichikawa et al, 1985;Grove, 1990;Smith et al, 1991;Cashman, 1993). Once a crystal has nucleated, it grows at a rate which can be controlled by either interface kinetics or diffusion.…”

Section: Nucleationmentioning

confidence: 99%

Magma Oceans and Primordial Mantle Differentiation

Solomatov

2007

Treatise on Geophysics

146

242

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Section: Nucleationmentioning

confidence: 99%

Magma Oceans and Primordial Mantle Differentiation

Solomatov

2007

Treatise on Geophysics

146

242

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“…However, later on, some work was published where at least in certain melt, velocity ranges a correlation between melt flow and fragmentation was found. 136,137 Other authors assume a stronger influence of melt flow and state that grain refinement is not controlled by the breaking of dendrites by shear forces alone. 138 Fragmentation is observed in a transparent alloy under forced convection conditions, with the conclusion that 'shear forces cannot be completely discounted' in Ref.…”

Section: Melting and Simultaneous Solidification Dendrite Arm Coarsen...mentioning

confidence: 99%

Melting and remelting phenomena

Rettenmayr¹

2009

International Materials Reviews

131

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Melting processes influence the microstructure evolution in metal alloys during casting and heat treatments. Melting is often treated as 'inverse solidification', which is only appropriate in a limited number of cases. In the present article, asymmetry between solidification and melting is reviewed in detail. The current state of the thermodynamic description of melting under diffusion control is outlined. Kinetic aspects that break the symmetry between solidifi-cation and melting that are discussed are solute partitioning, solute concentration gradients and solute transport in the involved phases. The view on nucleation of liquid and pre-melting phenomena, mostly of pure materials, based on experimental and theoretical work, is given. Emphasis is laid on aspects of melting with technical relevance, i.e. melting of alloys. Particu-larities of thermally and solutally controlled melting are introduced. Mechanisms that involve both melting and solidification simultaneously are capillary driven coarsening, temperature gradient zone melting and liquid film migration. The impact of these processes on microstructural evolution is discussed. Open questions concerning modelling and simulation of melting, namely, the interaction of different melting mechanisms and the role of the solid/liquid inter-face, are identified.

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“…8,20,24 Equiaxed crystals form directly in the melt, dispersed uniformly and contribute to the final solidified microstructure, producing fine globular structures, thanks to the convection provided by stirring. Stirring not only improves the slurry features but also extends its lifetime before full solidification.…”

Section: Resultsmentioning

confidence: 99%

Internal cooling process to prepare aluminium rheocasting feedstock

Birol

2010

International Journal of Cast Metals Research

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Immersion cooling and stirring are two elements of the internal cooling process recently proposed to produce aluminium rheocasting feedstock. They were employed in various combinations to identify the impact of each on the evolution of globular structures. AlSiMg melt sample water quenched above the liquidus point and after cooling into the semisolid temperature range produces predominantly dendritic dendritic features, typical of conventionally cast structures. Improvement in slurry features is noted when cooling below the liquidus temperature involves either stirring or immersion cooling. Internal cooling process which employs both immersion cooling and stirring produces smaller globules than those possible with stirring alone. Globular structures are obtained earlier and are refined further when internal cooling is extended to achieve higher solid fractions before quenching.

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Crystallization of a faceted primary phase in a stirred slurry

Cited by 21 publications

References 8 publications

Magma Oceans and Primordial Mantle Differentiation

Magma Oceans and Primordial Mantle Differentiation

Melting and remelting phenomena

Internal cooling process to prepare aluminium rheocasting feedstock

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