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Published **2000**
by U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology in Gaithersburg, MD .

Written in English

- Binary systems (Metallurgy) -- Stability,
- Thermal diffusivity

**Edition Notes**

Statement | S. Van Vaerenbergh, S.R. Coriell, G.B. McFadden |

Series | NISTIR -- 6586 |

Contributions | Coriell, S. R, McFadden, Geoffrey B, National Institute of Standards and Technology (U.S.) |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 18 p. |

Number of Pages | 18 |

ID Numbers | |

Open Library | OL15319188M |

The effect of a temperature-dependent solute diffusion coefficient on the morphological stability of a binary alloy during directional solidification is treated by a linear stability analysis. Get this from a library! Morphological stability of a binary alloy: temperature-dependent diffusivity. [S van Vaerenbergh; S R Coriell; Geoffrey B McFadden; National Institute of . The directional solidification model assumes vertical growth of a binary alloy at constant velocity. Buoyant thermosolutal convection and morphological stability are treated via a stability analysis of the linearized governing equations and boundary conditions, which include the Boussinesq form of the Navier-Stokes equations for viscous flow Cited by: 1. We study the stability of a planar solid-melt boundary during directional solidification of a binary alloy when the solid is being periodically vibrated in the direction parallel to the boundary (or equivalently, under a far field uniform and oscillatory flow parallel to the planar boundary). The analysis is motivated by directional solidification experiments under the low level residual.

Wheeler A.A. () A Strongly Nonlinear Analysis of Morphological Stability of a Binary Alloy: Solutal Convection and the Effect of Density Mismatch. In: Davis S.H., Huppert H.E., Müller U., Worster M.G. (eds) Interactive Dynamics of Convection and Solidification. NATO ASI Series (Series E: Applied Sciences), vol Springer, Dordrecht. We present a morphological stability analysis of the directional solidification of a binary alloy in the presence of a constant velocity flow imposed far from the solid-liquid interface. We consider directional solidification of a binary alloy during the initial transient period in which the interface velocity, concentration, and temperature gradients are changing with time. We introduce sinusoidal perturbations of the planar crystal-melt interface and numerically calculate the time evolution of these perturbations. The results for morphological instability are in good. The effects of the coupling between the morphological stability of a planar, horizontal crystal-melt interface of a growing crystal and solutal convection in the melt are explored using linear perturbation theory. The results are compared with the Mullins-Sekerka criterion (J. Appl. Phys. 35 () ) for morphological stability which neglects the effects of convection and with the recent.

The effect of the temperature dependence of the diffusion coefficient on the morphological stability of a binary alloy during directional solidification is treated by a linear stability analysis. The Soret effect is also included in the analysis. Specific calculations are carried out for a tin alloy containing silver for which the diffusion. An investigation is made of the weakly nonlinear morphological stability of a uniformly moving planar solid-liquid interface during the controlled unidirectional solidification of a dilute binary substance by the process of liquid phase electro-epitaxy (LPEE). A prototype model equation for LPEE is considered which postulates two-dimensional diffusion and electromigration of solute under a. This distinctive alloy system is verified via investigating the dependence of the LUMO energy level and open-circuit voltage on the weight ratio of IDT-OT in the acceptor blend and the miscibility of the two acceptors by morphological characterization and water contact angle measurements. The effect of a periodically varying growth rate on the morphological instability of a crystal growing from a binary alloy is considered using linear stability theory. We consider a planar interface with a crystal growth rate proportional to 1+? cos?? (where? is time) advancing into a liquid of semi-infinite extent. The linearised perturbation equations are solved by four different methods.

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