Results 231 to 240 of about 1,840,121 (280)

The thermokinetic modeling of substrate rapid solidification

JOM, 1994
A boundary problem arising from rapid solidification with changing conditions at the moving boundary for the classical Stefan problem was solved by combining the heat transfer with crystallization kinetics using a front-tracking finite-difference scheme. At each time step, the conditions at the moving boundary were determined by an iterative process.
Zhang, XZ, Atrens, A
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Rapid solidification characteristics in melt spinning

Materials Science and Engineering: A, 1992
The recalescence characteristics in rapid solidification of copper was studied using a thermokinetic model. The effects of the heat transfer coefficient, the melt thickness and the nucleation temperature were investigated. Results showed that lower nucleation temperature and thinner melt lead to a longer recalescence effect while larger heat transfer ...
Zhang, X, Atrens, A
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Dynamics of banded structure formation in rapid solidification

Physical Review Letters, 1992
Motivated by widespread experimental observations of the ``banded structure'' in rapidly solidified alloys, we have studied numerically by Green's-function method the dynamics of the planar interface under rapid directional solidification condition. We find that the formation of this structure can be explained and partially characterized quantitatively
, Karma, , Sarkissian
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Fundamentals of Rapid Solidification

1986
This paper reviews several fundamental aspects of the rapid solidification of metals and alloys. Different methods of measuring cooling rates during rapid solidification are described, and the observed cooling curves are analysed according to various cooling models.
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Application of Solidification Theory to Rapid Solidification Processing

1983
Abstract : The objective of this work is to develop guidelines based on kinetic and thermodynamic solidification theory for prediction and control of rapid solidification processes. In particular, segregation effects and rules governing the formation of equilibrium and non-equilibrium phases, including metallic glasses, will be investigated.
R. J. Schaefer, J. R. Manning, S. R. Coriell, J. W. Cahn, W. J. Boettinger   +4 more
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Kinetics and Morphology in Rapid Solidification

MRS Proceedings, 1983
ABSTRACTThe important parameters in all descriptions of the kinetics of crystallization behaviour are the differences in free energy Δgv between the liquid (glassy) phase and the various stable and metastable crystalline phases. The various quenching techniques can be subdivided into those in which the cooling rate is determined by the heat diffusivity
H. W. Bergmann, H. U. Fritsch
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Rapid Solidification of Metastable Materials

MRS Proceedings, 1981
ABSTRACTThere are numerous processing methods available for the fabrication of rapidly-solidified metastable alloys. Examples include splat quenching, melt-spinning, surface melting and quenching, melt atomization and solidification, and deposition by sputtering and evaporation.
Howard Liebermann, John Walter
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A Thermokinetic Model for Rapid Solidification

1992
A new boundary problem arising from rapid solidification with changing conditions at the moving boundary for the classical Stefan problem was solved by combined solution of the heat transfer equation and the crystallization kinetics using a front tracing finite difference scheme.
Zhang, X, Atrens, A
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Curvature effects in rapid alloy solidification

Physical Review E, 2001
The growth of a cylindrical or spherical crystal into its undercooled melt is a process whose description is complicated by the lack of a stationary regime. A simple approach to the problem, justified for low growth rates and widely used in the past for both pure substances and alloy solidification, is based on a quasistatic approximation which assumes
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Trapping of vacancies by rapid solidification

Acta Materialia, 2002
A model has been developed for the process of trapping of vacancies in rapid solidification of pure metals, which includes the effect of solute drag where vacancies play the role of solute. Within a reasonable range of parameter values it predicts that substantial trapping cannot occur unless the solidification velocity is 1 m/s or higher.
Mats Hillert, Martin Schwind, Malin Selleby   +2 more
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