Solid-state phase transformation kinetics in the near-equilibrium regime

Jiang, Yihui; Liu, Feng; Wang, Jincheng; Zhang, Zhonghua

doi:10.1007/s10853-014-8625-1

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The solid-state transformations are usually controlled by the nucleation and growth processes of the new phase, which is described with a first-order transition kinetic rate. The Johnson-Mehl Avrami (JMA) approach is widely used in studies dedicated to transformation kinetics of powders at solid state (Duan et al, 2015, Jiang et al, 2014. The JMA equation is expressed as follows:…”

Section: Analysis Of the Transformation Kinetic Rate And Mechanism Ofmentioning

confidence: 99%

Processing-induced-transformations (PITs) during direct compression: Impact of tablet composition and compression load on phase transition of caffeine

Juban

Briançon

Puel

2016

International Journal of Pharmaceutics

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In the pharmaceutical field, solid-state transitions that may occur during manufacturing of pharmaceuticals are of great importance. The phase transition of a model API, caffeine Form I (CFI), was studied during direct compression process by analysing the impacts of the operating conditions (process and formulation). This work is focused on two formulation parameters: nature of the diluent and impact of the caffeine dilution, and one process parameter: the compression pressure that may impact the phase transition of CFI. Tablets were made from pure CFI and from binary mixture of CFI/diluent (microcrystalline cellulose or anhydrous dicalcium phosphate). A kinetic study performed during six months helped to highlight the influence of these parameters on the CFI transition degree. Results showed a triggering effect of the direct compression process, transformation was higher in tablets than in uncompressed powders. Whatever the pressure applied, CFI transition degree was almost constant and uniformly occurring throughout the tablet volume. Nevertheless, several differences on the evolution of the CFI transition degree were observed between binary mixtures of CFI/diluent. An analysis of the transition mechanism with a stretched exponential law of the Johnson-Mehl-Avrami model shows that tableting accelerates the polymorphic transition without modifying its mechanism controlled by nucleation only.

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Section: Analysis Of the Transformation Kinetic Rate And Mechanism Ofmentioning

confidence: 99%

Processing-induced-transformations (PITs) during direct compression: Impact of tablet composition and compression load on phase transition of caffeine

Juban

Briançon

Puel

2016

International Journal of Pharmaceutics

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“…In general, there exist two types of phase transformations during heat treatment [8][9][10][11]. One is isothermal transformation, and the other is non-isothermal transformation in continuous cooling.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the precipitation kinetics and morphology evolution of lamellar α in Ti-alloys during non-isothermal treatments

Liu¹,

Li²,

Zhan³

2022

Modelling Simul. Mater. Sci. Eng.

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The non-isothermal diffusional phase transformation plays an important role in adjusting materials microstructure. In the modelling of non-isothermal transformation, actual temperature history has a remarkable effect on the precipitation kinetics of new phase. When morphology anisotropy effect is considered, taking actual temperature history effect into account is very difficult for guaranteeing the accuracy of kinetics prediction. In order to solve this problem, a new non-isothermal transformation model in combination with cellular automaton (CA) method with mixed-controlled mode was proposed. In this new model, actual temperature history effect was characterized by the effects of cooling path and additive isothermal path on the nucleation and growth of new phase. Firstly, the cooling path with the consideration of supercooling effect was introduced into the created isothermal transformation theory model. Secondly, the temperature-time path (i.e., additive isothermal path) in CA model was calibrated by using the solute concentration model from experiments. With the use of this new model, the precipitation kinetics and morphology evolution of the lamellar α for IMI834 titanium alloy during continuous cooling from single-phase region was predicted. The predicted results were in good agreement with experiments. It was also revealed that the dominant role of mixed-controlled mode for lamellar α precipitation was gradually changed from the diffusion control to the interface control with the increase of cooling rate.

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“…Mechanical and functional properties of materials such as metals and alloys are largely dependent on their microstructure characteristics which include specific volume fraction of spatially distributed phases with different compositions and/or crystal structures, the size and morphology of grains with different orientations and their spatial distribution [1,2]. Due to solid-state diffusional phase transformation, which involves nucleation, growth and impingement, directly results in the arrangements of constituent phases with different grains size and morphology, it plays an important role in the production of materials with various microstructures [3]. For better control over the material microstructures and thus tailor the properties of metals and alloys, comprehensively understanding and manipulating the process of solid-state diffusional phase transformations are vital and necessary.…”

Section: Introductionmentioning

confidence: 99%

A review on the modeling and simulations of solid-state diffusional phase transformations in metals and alloys

Liu

Zhan

2018

Manufacturing Rev.

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Solid-state diffusional phase transformations are vital approaches for controlling of the material microstructure and thus tailoring the properties of metals and alloys. To exploit this mean to a full extent, much effort is paid on the reliable and efficient modeling and simulation of the phase transformations. This work gives an overview of the developments in theoretical research of solid-state diffusional phase transformations and the current status of various numerical simulation techniques such as empirical and analytical models, phase field, cellular automaton methods, Monte Carlo models and molecular dynamics methods. In terms of underlying assumptions, physical relevance, implementation and computational efficiency for the simulation of phase transformations, the advantages and disadvantages of each numerical technique are discussed. Finally, trends or future directions of the quantitative simulation of solid-state diffusional phase transformation are provided.Keywords: Solid-state diffusional phase transformation / numerical simulation / empirical and analytical models / phase-field models / cellular automata / Monte Carlo models / molecular dynamics methods *

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Solid-state phase transformation kinetics in the near-equilibrium regime

Cited by 4 publications

References 40 publications

Processing-induced-transformations (PITs) during direct compression: Impact of tablet composition and compression load on phase transition of caffeine

Processing-induced-transformations (PITs) during direct compression: Impact of tablet composition and compression load on phase transition of caffeine

Modeling of the precipitation kinetics and morphology evolution of lamellar α in Ti-alloys during non-isothermal treatments

A review on the modeling and simulations of solid-state diffusional phase transformations in metals and alloys

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