Results 231 to 240 of about 502,495 (311)

Directional solidification with ACRT

Journal of Crystal Growth, 1993
Abstract 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, M. Larrousse, W.R. Wilcox, L.L. Regel   +3 more
openaire   +1 more source

Directional solidification of Ni3Al

Acta Metallurgica et Materialia, 1992
Abstract 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
openaire   +1 more source

Microfaceting in directional solidification

Solid State Communications, 1994
Abstract 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
openaire   +1 more source

Directional solidification of gallium under time-dependent magnetic fields with in situ measurements of the melt flow and the solid-liquid interface

Journal of Crystal Growth, 2019
The results of solidification experiments with gallium in a square-based 220 x 220 mm 2 container under the influence of alternating and travelling magnetic fields are presented.
N. Thieme, M. Keil, D. Meier, P. Bönisch, K. Dadzis, O. Pätzold, M. Stelter, L. Büttner, Jürgen W. Czarske   +8 more
semanticscholar   +1 more source

Directional solidification under stress

Physical Review E, 1998
Directional 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, Klaus Kassner, Chaouqi Misbah, Heiner Müller-Krumbhaar   +3 more
openaire   +1 more source

Wavelength Selection in Directional Solidification

Physical Review Letters, 1986
Cell-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.
openaire   +2 more sources

Testing shape selection in directional solidification

Physical Review B, 1987
We 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
openaire   +2 more sources

Linear stability of directional solidification cells

Physical Review A, 1990
We formulate the problem of finding the stability spectrum of the cellular pattern seen in directional solidification. This leads to a nonlinear eigenvalue problem for an integro-differential operator. We solve this problem numerically and compare our results to those obtained by linearizing the eigenvalue problem by employing the quasistatic ...
, Kessler, , Levine
openaire   +2 more sources

Asymmetric cell in directional solidification

Physical Review E, 1993
An asymmetric cell is obtained numerically in the symmetric model of directional solidification. It bifurcates off the symmetric cell branch and has a zero transversal velocity. The bifurcation point is characterized by a parity breaking and a period doubling. The bifurcation diagram around the codimension-two point found in previous work [Phys. Rev. A
openaire   +2 more sources

Directional solidification of aluminium–copper alloys

Materials Science and Engineering: A, 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−
ÇADIRLI, Emin, Gunduz, Mehmet
openaire   +2 more sources