Kinetics of Isothermal Phase Transformations by Phase-Field Simulations: An Analogy between the Peritectic and Monotectic Systems

2010 ◽  
Vol 297-301 ◽  
pp. 1152-1159
Author(s):  
G. Boussinot ◽  
Efim A. Brener ◽  
D.E. Temkin
Keyword(s):  
Phase Transformations ◽  
Phase Field ◽  
Liquid Mixture ◽  
Peritectic Temperature ◽  
Monotectic Temperature ◽  
Monotectic System ◽  
Liquid Film Migration ◽  
Solid Liquid ◽  
Kinetics Of ◽  
Generic Process

We present phase-field simulations of isothermal phase transformations in the peritectic system below and above the peritectic temperature TP , and in the monotectic system below the monotectic temperature TM. We focus particularly on the Liquid-Film-Migration (LFM) mechanism, which appears to be the generic process for phase transformations above TP . Below TP , we obtain an assymetric LFM, suggesting the existence of a doublon structure in free space. In the monotectic system, the transformation from a liquid L1 to a solid+liquid L2 mixture proceeds via the migration of a L2 film, which is the analogous of the LFM process. When the metastable state consists of a liquid-liquid mixture, a dendritic-like solidification is obtained.

Prediction of the kinetics of the phase transformations and the associated microstructure during continuous coolingin the Ti17

2004 ◽  
Vol 120 ◽  
pp. 93-101
Author(s):  
J. Da Costa Teixeira ◽  
L. Héricher ◽  
B. Appolaire ◽  
E. Aeby-Gautier ◽  
G. Cailletaud ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Phase Field ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Thermal Gradients ◽  
Resistivity Measurements ◽  
Isothermal Conditions ◽  
Kinetics Of

The aim of this paper is to present recent experimental results and related simulation about the β → αGB + αWGB and → αWI transformations which occur in the Ti17 alloy during the thermal treatments following the heating in the β phase field. These phase transformations were experimentally studied under isothermal conditions in samples with negligible thermal gradients. The IT diagram was obtained, on the basis of electrical resistivity measurements and microstructural SEM observations. The kinetics of the phase transformation was further numerically simulated for continuous cooling on the basis of a formerly developed model giving the amount of each morphology (αWGB, αWI). Experimental and calculated results are compared.

An Organodiselenide Containing Electrolyte Enables Sulfurized Polyacrylonitrile Cathodes with Fast Redox Kinetics in Li-S batteries

2021 ◽  
Author(s):  
Wei Zhang ◽  
Qiang Wu ◽  
Ziqi Zeng ◽  
Chuang Yu ◽  
Shijie Cheng ◽  
...  
Keyword(s):  
Liquid Interface ◽  
Electrolyte Additive ◽  
Redox Kinetics ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Kinetics Of

A soluble organoselenide compound, phenyl diselenide (PDSe), is employed as a soluble electrolyte additive to enhance the kinetics of sulfurized polyacrylonitrile cathode, in which radical exchange in the solid-liquid interface...

scholarly journals Numerical Phase-Field Model Validation for Dissolution of Minerals

2021 ◽  
Vol 11 (6) ◽  
pp. 2464
Author(s):  
Sha Yang ◽  
Neven Ukrainczyk ◽  
Antonio Caggiano ◽  
Eddie Koenders
Keyword(s):  
Phase Field ◽  
Liquid Interface ◽  
Mineral Dissolution ◽  
Experimental Results ◽  
Wide Range ◽  
Congruent Dissolution ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Dissolution Of Minerals ◽  
Meso Scale

Modelling of a mineral dissolution front propagation is of interest in a wide range of scientific and engineering fields. The dissolution of minerals often involves complex physico-chemical processes at the solid–liquid interface (at nano-scale), which at the micro-to-meso-scale can be simplified to the problem of continuously moving boundaries. In this work, we studied the diffusion-controlled congruent dissolution of minerals from a meso-scale phase transition perspective. The dynamic evolution of the solid–liquid interface, during the dissolution process, is numerically simulated by employing the Finite Element Method (FEM) and using the phase–field (PF) approach, the latter implemented in the open-source Multiphysics Object Oriented Simulation Environment (MOOSE). The parameterization of the PF numerical approach is discussed in detail and validated against the experimental results for a congruent dissolution case of NaCl (taken from literature) as well as on analytical models for simple geometries. In addition, the effect of the shape of a dissolving mineral particle was analysed, thus demonstrating that the PF approach is suitable for simulating the mesoscopic morphological evolution of arbitrary geometries. Finally, the comparison of the PF method with experimental results demonstrated the importance of the dissolution rate mechanisms, which can be controlled by the interface reaction rate or by the diffusive transport mechanism.

Kinetics of phase transformations in real finite systems: Application to switching in ferroelectrics

1998 ◽  
Vol 84 (1) ◽  
pp. 445-451 ◽  
Author(s):  
Vladimir Shur ◽  
Evgenii Rumyantsev ◽  
Sergei Makarov
Keyword(s):  
Phase Transformations ◽  
Finite Systems ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document