Three-dimensional phase-field simulations of coarsening kinetics of γ′ particles in binary Ni–Al alloys

2004 ◽  
Vol 52 (9) ◽  
pp. 2837-2845 ◽  
Author(s):  
J.Z. Zhu ◽  
T. Wang ◽  
A.J. Ardell ◽  
S.H. Zhou ◽  
Z.K. Liu ◽  
...  
Keyword(s):  
Phase Field ◽  
Three Dimensional ◽  
Al Alloys ◽  
Coarsening Kinetics ◽  
Kinetics Of

Phase Field Simulation of Coarsening Kinetics in Al-Sc and Al-Sc-Zr Alloys

2008 ◽  
Vol 1128 ◽  
Author(s):  
H. Zapolsky ◽  
J. Boisse ◽  
R. Patte ◽  
N. Lecoq
Keyword(s):  
Phase Field ◽  
Diffusion Coefficients ◽  
Three Dimensional ◽  
Ternary Alloys ◽  
Simulation Results ◽  
Coarsening Kinetics ◽  
Two Phases ◽  
Kinetics Of ◽  
Good Agreement ◽  
Zr Alloys

AbstractThe coarsening kinetics of γ’ precipitates in binary and ternary Al3Sc1-xZrx alloys is studied by using the two- and three-dimensional phase-field simulations. Our focus is on the influence of diffusion coefficients of Sc and Zr atoms on the transformation path kinetics from disordered f.c.c. matrix to two phases equilibrium state with γ’ precipitates and f.c.c. disordered matrix. Our simulation results demonstrate that in the case of binary alloys taking into account the concentration dependence of the mobility of atoms decreases the coarsening rate. In the case of ternary alloys we show that the Al3Sc particles precipitate first following by appearance of a Zr-rich shell. Our simulations results are in good agreement with experimental observations.

scholarly journals Structure and kinetics of three-dimensional defects on the {101¯2} twin boundary in magnesium: Atomistic and phase-field simulations

2020 ◽  
Vol 143 ◽  
pp. 103314 ◽  
Author(s):  
Douglas E. Spearot ◽  
Vincent Taupin ◽  
Khanh Dang ◽  
Laurent Capolungo
Keyword(s):  
Twin Boundary ◽  
Phase Field ◽  
Three Dimensional ◽  
Kinetics Of

Kinetics of Coarsening and Solid Sphericity during Reheating of Ductile Iron and Al Alloys

2006 ◽  
Vol 116-117 ◽  
pp. 205-208 ◽  
Author(s):  
P. Babaghorbani ◽  
S. Salarfar ◽  
Mahmoud Nili-Ahmadabadi
Keyword(s):  
Cast Iron ◽  
Solid State ◽  
Ostwald Ripening ◽  
Ductile Cast Iron ◽  
Al Alloys ◽  
Solid Particles ◽  
Coarsening Kinetics ◽  
Semi Solid ◽  
Reheating Process ◽  
Kinetics Of

Reheating process in the semi-solid state is a very important step in the thixoforming process. In this research semi-solid ductile cast iron and Al alloys (Al-2.5Si, Al356) prepared by inclined plate method, were reheated to examine the effect of reheating conditions on the microstructure and coarsening kinetics of the alloys. For ductile cast iron, solid fraction at different reheating temperatures and holding times was obtained and based on these results the optimum reheating temperature range was determined. In the case of Al alloys increase of holding time in the semi-solid state, leads to increase of liquid fraction, solid grain size and improvement of sphericity of solid particles. In addition, the results show that coarsening kinetics of microstructures of both alloys during reheating was diffusion controlled and can be mostly treated by Ostwald ripening theory.

On the kinetics of dendritic sidebranching: A three dimensional phase field study

2016 ◽  
Vol 119 (16) ◽  
pp. 164305 ◽  
Author(s):  
Shan Shang ◽  
Zhipeng Guo ◽  
Zhiqiang Han
Keyword(s):  
Field Study ◽  
Phase Field ◽  
Three Dimensional ◽  
Kinetics Of

Effect of Initial Particle Size on Coarsening Kinetics of γ Prime Precipitate in Nickel-Based Superalloy - A Phase Field Study

2011 ◽  
Vol 117-119 ◽  
pp. 1834-1838
Author(s):  
Chang Bo Ke ◽  
Bao Zhong Xie
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Phase Field ◽  
Precipitate Size ◽  
Initial Particle ◽  
Initial Particle Size ◽  
Initial Size ◽  
Gamma Prime ◽  
Coarsening Kinetics ◽  
Kinetics Of

The effect of initia gamma prime particle size on coarsening kinetics of gamma prime precipitates in Nickel-based superalloys has been studied by means of phase field method which takes into account the lattice misfit. The simulation shows that the gamma prime precipitate morphology at the late stage of coarsening is independent of initial particle size, and the rectangle-like precipitates dominate the matrix which is in good agreement with experimental studies. The coarsening exponent increases with initial size, while the coarsening rate constant exhibits no apparent regularity. Although the coarsening trend is independent of initial particle size, the precipitate size increases with initial size at a given aging time. Through precipitate size distribution calculation, it is found that the size distribution is fairly stable, which is not sensitive to the initial particle size.

Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys

1997 ◽  
Vol 238 (1) ◽  
pp. 13-22 ◽  
Author(s):  
H.A. Calderon ◽  
G. Kostorz ◽  
Y.Y. Qu ◽  
H.J. Dorantes ◽  
J.J. Cruz ◽  
...  
Keyword(s):  
Al Alloys ◽  
Coarsening Kinetics ◽  
Kinetics Of

scholarly journals Dendrite fragmentation: an experiment-driven simulation

2018 ◽  
Vol 376 (2113) ◽  
pp. 20170213 ◽  
Author(s):  
T. Cool ◽  
P. W. Voorhees
Keyword(s):  
Phase Field ◽  
Contact Region ◽  
Three Dimensional ◽  
Dendritic Structure ◽  
Phase Field Model ◽  
Alloy System ◽  
Growth Conditions ◽  
Dendrite Fragmentation ◽  
Kinetics Of ◽  
Small Spacing

The processes leading to the fragmentation of secondary dendrite arms are studied using a three-dimensional Sn dendritic structure that was measured experimentally as an initial condition in a phase-field simulation. The phase-field model replicates the kinetics of the coarsening process seen experimentally. Consistent with the experiment, the simulations of the Sn-rich dendrite show that secondary dendrite arm coalescence is prevalent and that fragmentation is not. The lack of fragmentation is due to the non-axisymmetric morphology and comparatively small spacing of the dendrite arms. A model for the coalescence process is proposed, and, consistent with the model, the radius of the contact region following coalescence increases as t 1/3 . We find that small changes in the width and spacing of the dendrite arms can lead to a very different fragmentation-dominated coarsening process. Thus, the alloy system and growth conditions of the dendrite can have a major impact on the fragmentation process. This article is part of the theme issue ‘From atomistic interfaces to dendritic patterns’.

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