A Phase Transformation Model for the Austenitisation of Martensite in Dual-Phase Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4608-4613 ◽  
Author(s):  
Richard G. Thiessen ◽  
Jilt Sietsma ◽  
I.M. Richardson
Keyword(s):  
Dual Phase Steel ◽  
Driving Forces ◽  
Field Method ◽  
Nucleation And Growth ◽  
Transformation Model ◽  
Nucleation Theory ◽  
Phase Field Method ◽  
Classical Nucleation Theory ◽  
Dual Phase ◽  
Unique Approach

This work presents a unique approach for the modelling of the austenitisation of martensite in dual-phase steels within the phase-field method. Driving forces for nucleation and growth are derived from thermodynamic databases. Routines for nucleation are based on a discretisation of the classical nucleation theory. Validation is given via dilatometric experiments.

Simultaneous SAXS/WAXS/UV–Vis Study of the Nucleation and Growth of Nanoparticles: A Test of Classical Nucleation Theory

Langmuir ◽  
2015 ◽  
Vol 31 (42) ◽  
pp. 11678-11691 ◽  
Author(s):  
Xuelian Chen ◽  
Jan Schröder ◽  
Stephan Hauschild ◽  
Sabine Rosenfeldt ◽  
Martin Dulle ◽  
...  
Keyword(s):  
Nucleation And Growth ◽  
Nucleation Theory ◽  
Classical Nucleation Theory

scholarly journals Нуклеация и рост зародышей новой фазы в гетерогенных реакциях

2019 ◽  
Vol 61 (12) ◽  
pp. 2412
Author(s):  
Н.М. Корценштейн
Keyword(s):  
Complex Systems ◽  
Condensed Phase ◽  
Growth Rates ◽  
Heterogeneous Reaction ◽  
Nucleation And Growth ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Definite Kind ◽  
Kinetics Of ◽  
Development Mechanism

Abstract Expressions for the nucleation and growth rates for condensed particles in a heterogeneous reaction of a definite kind have been derived, which allows the kinetics of the formation of the condensed phase in some complex systems to be described. Methods of the classical nucleation theory and an assumption about the reaction development mechanism were used.

Study Of Nucleation And Growth Ev Al-Zn Alloys Using TEM

1993 ◽  
Vol 321 ◽  
Author(s):  
G. Sundar ◽  
E. A. Kenik ◽  
J. J. Hoyt ◽  
S. Spooner
Keyword(s):  
Completion Time ◽  
Nucleation And Growth ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Initial Value ◽  
Two Phase ◽  
Transmission Electron ◽  
Time Required ◽  
Zn Alloys

ABSTRACTNucleation and growth studies were conducted on Al-Zn alloys at several temperatures using transmission electron Microscopy (TEM) with an in-situ furnace. The value of the critical undercooling was established by noting the lowest temperature at which precipitates were no longer observed, following a quench into the two-phase metastable region. These results were compared with the Langer-Schwartz Model of nucleation and growth in which it is predicted that the half-completion time (i.e, the time required for the supersaturation to reach half its initial value) diverges for initial supersaturations which are higher than those predicted by the classical nucleation theory.

MONTE CARLO SIMULATION OF NUCLEATION AND GROWTH IN THE 3D NEAREST-NEIGHBOR ISING MODEL

2001 ◽  
Vol 12 (03) ◽  
pp. 345-359 ◽  
Author(s):  
JÜRN SCHMELZER ◽  
D. P. LANDAU
Keyword(s):  
Phase Diagram ◽  
Monte Carlo ◽  
Cluster Size ◽  
Nearest Neighbor ◽  
Ostwald Ripening ◽  
Nucleation And Growth ◽  
Size Distribution Function ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Regular Solutions

Monte Carlo simulations of nucleation and growth processes in an Ising-binary alloy model are presented. The evolution of the cluster size distribution function and its characteristic properties (mean radius and concentration of the clusters) has been investigated from the initial quench into the metastable region of the phase diagram until the establishment of the final equilibrium. All classical stages of nucleation and growth could be observed, the stages of steady-state nucleation, independent growth and Ostwald ripening. A quantitative analysis of the simulational results in terms of the theory of regular solutions shows the validity of classical nucleation theory in the region of the phase diagram considered and provides evidence for a size and structure dependent interfacial tension between the two newly formed phases.

scholarly journals Mechanistic inferences from analysis of measurements of protein phase transitions in live cells

2020 ◽  
Author(s):  
Ammon E. Posey ◽  
Kiersten M. Ruff ◽  
Jared M. Lalmansingh ◽  
Tejbir S. Kandola ◽  
Jeffrey J. Lange ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Separation ◽  
Phase Behavior ◽  
Driving Forces ◽  
Local Density ◽  
Expression Profiles ◽  
Resonance Energy ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Live Cells

AbstractThe combination of phase separation and disorder-to-order transitions can give rise to ordered, semi-crystalline fibrillar assemblies that underlie prion phenomena namely, the non-Mendelian transfer of information across cells. Recently, a method known as Distributed Amphifluoric Förster Resonance Energy Transfer (DAmFRET) was developed to study the convolution of phase separation and disorder-to-order transitions in live cells. In this assay, a protein of interest is expressed to a broad range of concentrations and the acquisition of local density and order, measured by changes in FRET, is used to map phase transitions for different proteins. The high-throughput nature of this assay affords the promise of uncovering sequence-to-phase behavior relationships in live cells. Here, we report the development of a supervised method to obtain automated and accurate classifications of phase transitions quantified using the DAmFRET assay. Systems that we classify as undergoing two-state discontinuous transitions are consistent with prion-like behaviors, although the converse is not always true. We uncover well-established and surprising new sequence features that contribute to two-state phase behavior of prion-like domains. Additionally, our method enables quantitative, comparative assessments of sequence-specific driving forces for phase transitions in live cells. Finally, we demonstrate that a modest augmentation of DAmFRET measurements, specifically time-dependent protein expression profiles, can allow one to apply classical nucleation theory to extract sequence-specific lower bounds on the probability of nucleating ordered assemblies. Taken together, our approaches lead to a useful analysis pipeline that enables the extraction of mechanistic inferences regarding phase transitions in live cells.

scholarly journals Incubation Time at Decomposition of Solid Solution – Stochastic Kinetic Mean-Field Versus Monte Carlo Simulation

2020 ◽  
Vol 65 (6) ◽  
pp. 488
Author(s):  
V. M. Pasichna ◽  
N. V. Storozhuk ◽  
A. M. Gusak
Keyword(s):  
Solid Solution ◽  
Monte Carlo ◽  
Mean Field ◽  
Field Method ◽  
Nucleation Theory ◽  
Tuning Parameter ◽  
Classical Nucleation Theory ◽  
Simulation Techniques ◽  
Field Versus ◽  
Temperature Dependences

The comparison of two simulation techniques applied to the nucleation in a supersaturated solid solution is made. The first one is the well-known Monte Carlo (MC) method. The second one is a recently developed modification of the atomistic self-consistent non-linear mean-field method with the additionally introduced noise of local fluxes: Stochastic Kinetic Mean-Field (SKMF) method. The amplitude of noise is a tuning parameter of the SKMF method in its comparison with the Monte Carlo one. The results of two methods for the concentration and temperature dependences of the incubation period become close, if one extrapolates the SKMF data to a certain magnitude of the noise amplitude. The results of both methods are compared also with the Classical Nucleation Theory (CNT).

Nucleation and Growth Characteristics of Thin Metal Films

1971 ◽  
Vol 29 ◽  
pp. 216-217
Author(s):  
H. P. Singh ◽  
L. E. Murr
Keyword(s):  
Thin Films ◽  
Three Dimensional ◽  
Metal Films ◽  
Nucleation And Growth ◽  
Growth Characteristics ◽  
Thin Metal ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Thin Metal Films ◽  
Initial Deposition

This paper reports observations of nucleation and growth characteristics of thin metal films vapor deposited onto heated sodium chloride substrates. An attempt is made to explain the differences in nucleation and growth characteristics on the basis of classical nucleation theory.Thin metal films were prepared by vapor deposition onto heated NaCl (001) substrates in a commercial vacuum unit using a constant evaporation rate of approximately 1000 Å/sec. In the case of discontinuous thin films, approximately 200 Å of carbon was deposited for support. Samples for electron microscopy were prepared by standard techniques and were observed at 125 kV. Figs. 1(a) to (c) show a growth sequence of gold thin films characterized by 1) the formation of random, three dimensional, isolated nuclei at initial deposition, and their growth with further deposition predominantly by surface diffusion; 2) coalescence of these nuclei forming bigger islands; 3) the flattening of islands and formation of network structure : and 4) the filling up of these network structures with further deposition forming a continuous film.

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