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Role of shielding gas in tailoring microstructure and anisotropy in wire arc additive manufactured Inconel 686. [PDF]
Sci RepAjithkumar S +3 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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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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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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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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Microfaceting in directional solidification
Solid State Communications, 1994Abstract When a thick impurity atom, like Sr, sticks to the solidification front, the latter tends to acquire a sawtooth profile in order to optimally accomodate the adsorbed monolayer. The effect is briefly described on thermodynamic and crystallographic grounds.
D. Camel, M. Papoular
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Directional solidification under stress
Physical Review E, 1998Directional solidification under uniaxial stress is analyzed. In the absence of stress, it is well known that the moving planar front undergoes a morphological Mullins-Sekerka (MS) instability. Under uniaxial stress, even an interface at rest develops an instability known by the names of Asaro, Tiller, and Grinfeld (ATG).
Isabelle Cantat +3 more
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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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Testing shape selection in directional solidification
Physical Review B, 1987We report results from an experiment on the directional solidification of pivalic acid. In addition to the usual cellular interface patterns, we observe a new, metastable dendritic form that can be interpreted in the light of recent ideas about pattern formation.
, Bechhoefer, , Libchaber
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