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Directional solidification of aluminium–copper alloys [PDF]
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2002 Abstract Directional solidification experiments have been carried out on different Al–Cu alloys as a function of solidification parameters, temperature gradient G, growth rate V, and composition C0. The specimens were solidified under steady state conditions with a constant temperature gradient (7.4 K mm−1) at a wide range of growth rates (9–490 μm s−
M Gunduz
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Acta Materialia, 2014 International audienceSix alloys were directionally solidified at low growth speeds (1-5 mu m s(-1)) under a weak transverse magnetic field (
Yves Fautrelle +2 more
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Shallow cells in directional solidification
Physical Review Letters, 1989The existing theory on two-dimensional transitions (appropriate to thin parallel-plate geometries) is presented in such a way that it is possible to identify easily conditions for the onset of shallow cells. Conditions are given under which succinonitrile-acetone mixtures should undergo supercritical bifurcation in experimentally accessible ranges ...
, Merchant, , Davis
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Direct observation of microbubbles in directional solidification of salol
Physical Review Letters, 1990Dynamic light scattering at the crystal-melt interface of solidifying salol was followed for 14 days. The hydrodynamic radius deduced from intensity correlation data increased continuously from {approx}1 to {approx}100 {mu}m. When the scattering layer was trapped by the advancing crystal front, microscopic observation revealed bubbles as inclusions ...
, Williams, , Srinivasan, , Cummins
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Directional solidification of Ni3Al
Acta Metallurgica et Materialia, 1992Abstract A nickel aluminide intermetallic material (IC-50) was directionally solidified under various growth rates utilizing a modified Bridgeman apparatus. The microstructural features of interest, namely: primary dentrite arm spacing (PDAS); secondary dendrite arm spacing (SDAS); and dendrite tip radius of curvature (ϱ) were measured as functions ...
H.K Kim, J.C Earthman, E.J Lavernia
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Directional solidification with ACRT
Journal of Crystal Growth, 1993Abstract The interfacial mass transfer rate between the endwall and the bulk liquid in a vertical Bridgman configuration was measured during spin-up and spin-down (ACRT). The enhancement of mass transfer rate caused by spin-up and spin-down persisted much longer than the Ekman time after an impulsive change of the ampoule rotation rate.
J. Zhou +3 more
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Applied Mechanics Reviews, 1990
The mechanical and electrical properties of crystals produced by a unidirectional process depend strongly on the temperature and flow field in the melt since these control the concentration of solute at the melt–crystal interface. The solute gradient there drives morphological instabilities that lead to cellular or dendritic interfaces.
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The mechanical and electrical properties of crystals produced by a unidirectional process depend strongly on the temperature and flow field in the melt since these control the concentration of solute at the melt–crystal interface. The solute gradient there drives morphological instabilities that lead to cellular or dendritic interfaces.
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Wavelength Selection in Directional Solidification
Physical Review Letters, 1986Cell-spacing selection in directional solidification is investigated. An integral equation describing steady-state cells in the limit where the solute diffusion length is much larger than the cell spacing is derived and solved numerically by Newton's method.
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