Growth in normal eutectic solidification

Elliott, R.

doi:10.1016/b978-0-408-10714-3.50008-3

Eutectic Solidification Processing 1983

DOI: 10.1016/b978-0-408-10714-3.50008-3

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Growth in normal eutectic solidification

R. Elliott¹

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1992

2008

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Cited by 3 publications

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“…The condition mentioned above is not fulfilled in Fig. 1a plotted by Hunt-Jackson [2], and reproduced further by Elliott [9], Rutter [10], and Kurz-Fisher [11].…”

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confidence: 78%

Concentration Micro-Field for Lamellar Eutectic Growth

Wołczyński

2008

DDF

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A possibility of a modification of the Jackson-Hunt theory of an oriented structure formation is analysed. A new model for the formation of a concentration field ahead of growing regular lamellae with respect to the solid / liquid interface shape is presented. A coordinate system applied in the model is attached to the solid / liquid interface to be advancing in the z - direction, identically with interface moving at a constant velocity, v . The solution to a diffusion equation is given for the improved formulation of the boundary conditions. The boundary conditions are related to the interplay between the diffusion required for phase separation and the formation of the interphase between both lamellae. The boundary conditions are formulated to establish the stability of lamellar structure formation under steady-state conditions. It is assumed that stable growth of the lamellae is ensured by the separation of concentration fields within a boundary layer ahead of the solid / liquid interfaces of both the α and β " phases. Coupled lamellar growth with the presence of a leading phase protrusion is defined. The general mass balance is analysed for a solute concentration in the liquid, taking into account a planar solid / liquid interface. A local mass balance is also ensured but it requires envisaging a protrusion of the minor eutectic phase. The existence of a lead distance is confirmed experimentally for the (Pb)-(Cd) eutectic system. The difference in undercooling is also considered as a phenomenon associated with the separation of concentration fields and the existence of a protrusion to relax the assumption of an isothermal interface (ideally coupled growth) given by the Hunt and Jackson theory.

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“…The condition mentioned above is not fulfilled in Fig. 1a plotted by Hunt-Jackson [2], and reproduced further by Elliott [9], Rutter [10], and Kurz-Fisher [11].…”

mentioning

confidence: 78%

Concentration Micro-Field for Lamellar Eutectic Growth

Wołczyński

2008

DDF

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Interflake spacing–growth velocity relationship in Al–Si and Al–CuAl₂eutectic alloys

Khan

Ourdjini²,

Elliott

1992

Materials Science and Technology

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Effect of growth rate on microstructure and microstructure evolution of directionally solidified Nb-Si alloys

Sekito¹,

Miura²,

Ohkubo³

et al. 2008

MRS Proc.

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In the present work, Nb-18.1Si-1.5Zr alloy rods are produced with a growth rate ranging from 1.5 to about 1500 mm/h using the optical floating zone (OFZ) furnace. A part of each specimen is heat-treated at 1650 oC for 100 h. The microstructure was observed using SEM and TEM and analyzed using EPMA and EBSD.Eutectic-cells are observed in as-grown specimens with a growth rate of 150 mm/h or higher. It is found by EBSD analysis that the solidification direction of Nb is along <113> and that of Nb3Si is along <001], and {112} of Nb and {110) of Nb3Si are parallel. The present crystallographic orientation relationship between Nb and Nb3Si is different from that found in previous reports by several researchers. It was also confirmed that the heat-treated microstructure in the specimen grown by OFZ with a growth rate of 150 mm/h is similar to that in the heattreated specimen prepared by arc-melting.

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Growth in normal eutectic solidification

Cited by 3 publications

References 20 publications

Concentration Micro-Field for Lamellar Eutectic Growth

Concentration Micro-Field for Lamellar Eutectic Growth

Interflake spacing–growth velocity relationship in Al–Si and Al–CuAl₂eutectic alloys

Effect of growth rate on microstructure and microstructure evolution of directionally solidified Nb-Si alloys

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Growth in normal eutectic solidification

Cited by 3 publications

References 20 publications

Concentration Micro-Field for Lamellar Eutectic Growth

Concentration Micro-Field for Lamellar Eutectic Growth

Interflake spacing–growth velocity relationship in Al–Si and Al–CuAl2eutectic alloys

Effect of growth rate on microstructure and microstructure evolution of directionally solidified Nb-Si alloys

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Product

Resources

About

Interflake spacing–growth velocity relationship in Al–Si and Al–CuAl₂eutectic alloys