Nonuniform distribution of second phase particles in melt-textured Y–Ba–Cu–O oxide with metal oxide (CeO2, SnO2, and ZrO2) addition

1995 ◽  
Vol 10 (7) ◽  
pp. 1605-1610 ◽  
Author(s):  
Chan-Joong Kim ◽  
Ki-Baik Kim ◽  
Gye-Won Hong ◽  
Ho-Yong Lee
Keyword(s):  
Liquid Phase ◽  
Metal Oxide ◽  
Fine Particles ◽  
Particle Interaction ◽  
Phase Region ◽  
Liquid Interface ◽  
Second Phase ◽  
Second Phase Particles ◽  
Solid Liquid Interface ◽  
Solid Liquid

Segregation of second-phase particles within Y1Ba2Cu3O7−y domain was investigated in melt-textured Y-Ba-Cu-O with metal oxide (CeO2, SnO2, and ZrO2) addition. It is found that coarse particles (Y2Ba1Cu1O5) are trapped with a special pattern in the interior of Y1Ba2Cu3O7−y domain, while fine BaCeO3 and BaSnO3 particles are present within the remnant liquid-phase region. During the growth of Y1Ba2Cu3O7−y domain, fine particles appear to be pushed out of the advancing Y1Ba2Cu3O7−y /liquid interface toward the liquid phase. The particle segregation that occurred during peritectic growth of the Y1Ba2Cu3O7−y domain was explained in terms of the Uhlmann-Chalmers-Jackson theory based on the particle interaction at solid/liquid interface.

Particle Pushing during Solidification of Metals and Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 1513-1517 ◽  
Author(s):  
Meng Wang ◽  
Qin You Han
Keyword(s):  
Alloy System ◽  
Liquid Interface ◽  
Second Phase ◽  
Matrix Composites ◽  
Freezing Front ◽  
Cooling Conditions ◽  
Second Phase Particles ◽  
Solid Liquid Interface ◽  
Particle Pushing ◽  
Solid Liquid

During the solidification of a liquid containing dispersed second phase particles, particles are either rejected or engulfed by the advancing solid-liquid interface. Theories have been proposed on the mechanisms on particle pushing by a freezing front. However, the critical growth velocities predicted are much smaller than actually found experimentally. This article evaluates mechanisms on particle pushing. A specially selected alloy system, an Al-Ti-B master alloy, was chosen to evaluate particle pushing under various solidification conditions. The final distribution of the particles in ingots was examined. It is concluded that most of the particles are pushed by the dendritic solid liquid interface under cooling conditions varying a few orders of magnitude. Mechanical disturbance, such as fluid flow in the remaining liquid of the mushy zone, promotes particle pushing by the growing solid. Keywords: Particle pushing, solidification, Aluminum alloys, and metal-matrix composites

Role of the solid/liquid interface faceting in rapid penetration of a liquid phase along grain boundaries

2001 ◽  
Vol 49 (7) ◽  
pp. 1123-1128 ◽  
Author(s):  
D. Chatain ◽  
E. Rabkin ◽  
J. Derenne ◽  
J. Bernardini
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

High pressurein situx-ray absorption spectroscopy cell for studying simultaneously the liquid phase and the solid/liquid interface

2005 ◽  
Vol 76 (5) ◽  
pp. 054104 ◽  
Author(s):  
Jan-Dierk Grunwaldt ◽  
Michael Ramin ◽  
Markus Rohr ◽  
Alexej Michailovski ◽  
Greta R. Patzke ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Absorption Spectroscopy ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

Natural Convection Influenced Ice-Water Systems Contained Between Concentric Spheres

2001 ◽  
Author(s):  
D. A. Sinton ◽  
B. R. Baliga
Keyword(s):  
Natural Convection ◽  
Liquid Phase ◽  
Computational Study ◽  
Water Systems ◽  
Liquid Interface ◽  
Two Dimensional ◽  
Concentric Spheres ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Ice Water

Abstract A computational study of natural convection influenced ice-water systems contained in the annular space between two concentric isothermal spheres is presented. An adaptive-grid control-volume finite element method (CVFEM) formulated for the solution of two-dimensional planar and axisymmetric problems was used in the computer simulations. The grid was designed to delineate the solid-liquid interface using a structured adaptation technique. In this study, attention is limited to three different two-dimensional axisymmetric, steady state, pure ice-water systems, with buoyancy-driven natural convection in the liquid phase: two of these systems involve ice adjacent to the inner sphere, and one system involves ice adjacent to the outer sphere. The dimensionless parameters are the following: a modified Rayleigh number, a density inversion parameter, the Prandtl number, radius ratio, and a temperature ratio. The results presented include solid-liquid interface shapes, streamlines and temperature contours in the liquid phase, and dimensionless local heat flux distributions along the surfaces of the inner and outer spheres, and the interface.

scholarly journals Nanoscale Mapping of Non-Uniform Heterogeneous Nucleation Kinetics Mediated by Surface Chemistry

2019 ◽  
Author(s):  
Mei Wang ◽  
Thilini Umesha Dissanayake ◽  
Chiwoo Park ◽  
Karen J. Gaskell ◽  
Taylor Woehl
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Surface Chemistry ◽  
Heterogeneous Nucleation ◽  
Liquid Interface ◽  
Nucleation Kinetics ◽  
Nucleation Sites ◽  
Solid Liquid Interface ◽  
Solid Liquid

<p>Nucleation underlies the formation of many liquid-phase synthetic and natural materials with applications in materials chemistry, geochemistry, biophysics, and structural biology. Most liquid-phase nucleation processes are heterogeneous, occurring at specific nucleation sites at a solid-liquid interface; however, the chemical and topographical identity of these nucleation sites and how nucleation kinetics vary from site-to-site remains mysterious. Here we utilize <i>in situ</i> liquid cell electron microscopy to unveil counterintuitive nanoscale non-uniformities in heterogeneous nucleation kinetics on a macroscopically uniform solid-liquid interface. Time-resolved <i>in situ</i> electron microscopy imaging of silver nanoparticle nucleation at a water-silicon nitride interface showed apparently randomly-located nucleation events at the interface. However, nanometric maps of local nucleation kinetics uncovered nanoscale interfacial domains with either slow or rapid nucleation. Interestingly, the interfacial domains vanished at high supersaturation ratio, giving way to rapid spatially uniform nucleation kinetics. Atomic force microscopy and nanoparticle labeling experiments revealed a topographically flat, chemically heterogeneous interface with nanoscale interfacial domains of functional groups similar in size to those observed in the nanometric nucleation maps. These results, along with a semi-quantitative nucleation model, indicate that a chemically non-uniform interface presenting different free energy barriers to heterogeneous nucleation underlies our observations of non-uniform nucleation kinetics. Overall, our results introduce a new imaging modality, nanometric nucleation mapping, and provide important new insights into the impact of surface chemistry on microscopic spatial variations in heterogeneous nucleation kinetics that have not been previously observed.</p>

scholarly journals In Situ Observation of Gold Nanoparticles Self-assembly at the Solid-Liquid Interface Using Liquid-Phase STEM

2021 ◽  
Vol 27 (S1) ◽  
pp. 2226-2227
Author(s):  
Arixin Bo ◽  
Björn Kuttich ◽  
Tobias Kraus ◽  
Niels de Jonge
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Phase ◽  
Self Assembly ◽  
Liquid Interface ◽  
In Situ Observation ◽  
Solid Liquid Interface ◽  
Solid Liquid

scholarly journals Thermodynamic Research on the Precipitation of Ti2O3, TiN and TiC in Continuous Casting of Titanium Microalloyed Steel

2021 ◽  
Vol 2076 (1) ◽  
pp. 012077
Author(s):  
Tengfei Zhao ◽  
Xiang Zheng ◽  
Dongjian Huang ◽  
Zhenghai Zhu ◽  
Zhihong Yin
Keyword(s):  
Liquid Phase ◽  
Continuous Casting ◽  
Microalloyed Steel ◽  
Phase Region ◽  
Second Phase ◽  
Two Phase ◽  
Initial Stage ◽  
Different Temperatures ◽  
C And N ◽  
Solid Liquid

Abstract The composite precipitation of Ti2O3 + TiN during continuous casting has an important influence on the microstructure and properties of the slab. In order to study the precipitation conditions of Ti2O3, TiN and TiC second phase in titanium microalloyed steel, the solid-liquid phase line temperature, the initial precipitation temperature of different second phase, the equilibrium and actual solubility product of Ti2O3, TiN and TiC at different temperatures are calculated, and the precipitation rules of titanium microalloyed steel in liquid steel and two-phase region are analyzed. The results show that: Ti2O3 and TiN can precipitate in molten steel, and the precipitation order of Ti2O3 is prior to that of TiN, while TiC does not precipitate. Due to the enrichment of Ti, O, C and N in the liquid phase during solidification, the equilibrium precipitation conditions of Ti2O3 and TiN are reached when the temperature is lower than 1469°C of the liquidus, and the precipitation begins at the initial stage of solidification. When the temperature in the two-phase region is lower than 1332°C, the precipitation of TiC begins.

Effect of Pulse Electric Field on the Columnar Crystals Growth of Al-5.6 Wt.%Cu during Unidirectional Solidification

2011 ◽  
Vol 299-300 ◽  
pp. 345-349
Author(s):  
Guo Wei Chang ◽  
Shu Ying Chen ◽  
Qing Chun Li ◽  
Li Li Guo ◽  
Xu Dong Yue
Keyword(s):  
Liquid Phase ◽  
Electric Field ◽  
Pulse Electric Field ◽  
Negative Electrode ◽  
Unidirectional Solidification ◽  
Liquid Interface ◽  
Equiaxed Crystal ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Pulse Electric

The influence of pulse electric field on the columnar crystals growth has been studied by employing pulse electric field vertically to the solid/liquid interface during unidirectional solidification. The results showed that the pulse electric field was favorable to columnar crystals growth with the increase of pulse electric field intensity when the liquid phase was the positive electrode of pulse electric field. The formation of equiaxed crystal was accelerated when the degree of composition supercooling in front edge of solid/liquid interface reached the degree of nucleation supercooling by pulse electric field. When the liquid phase was the negative electrode of pulse electric field, the growth of columnar crystals was hindered, and the formation of equiaxed crystal was accelerated by pulse electric field.

Sign in / Sign up

Export Citation Format

Share Document