PHASE--FIELD METHOD SIMULATION OF THE EFFECT OF ELASTIC STRAIN ENERGY ON COARSENING DYNAMICS DURING THE α2→O PHASE TRANSFORMATION IN Ti--Al--Nb ALLOYS

2013 ◽  
Vol 48 (4) ◽  
pp. 485-491
Author(s):  
Guangzhao ZHOU ◽  
Yongxin WANG ◽  
Zheng CHEN
Keyword(s):  
Phase Transformation ◽  
Phase Field ◽  
Elastic Strain ◽  
Strain Energy ◽  
Elastic Strain Energy ◽  
Field Method ◽  
Phase Field Method ◽  
Coarsening Dynamics

Phase-Field Simulation of γ"(D022) Precipitation in Ni Base Superalloys

2007 ◽  
Vol 561-565 ◽  
pp. 2287-2292 ◽  
Author(s):  
Toshiyuki Koyama ◽  
Hidehiro Onodera
Keyword(s):  
Phase Field ◽  
Strain Energy ◽  
Lattice Mismatch ◽  
Elastic Strain Energy ◽  
Field Method ◽  
Phase Field Method ◽  
Two Phase ◽  
Field Modeling ◽  
Fe Alloys ◽  
Key Parameter

Although the γ"(D022) phase has been known as a strengthen phase for the turbine disk of wrought Ni-base superalloys, the computer simulation of the γ"(D022) precipitation is hardly performed. In this study, it is demonstrated that the phase-field modeling of the complex microstructure developments including γ"(D022) precipitation in Ni-V-X (X=Co,Nb,Fe) alloys. The simulation results obtained are as follows: (1) The complex morphologies of the γ(A1)+γ"(D022) two-phase microstructure, such as the maze-microstructure, the chessboard-microstructure, and the chessboard-like microstructure, in Ni-V-X (X=Co,Nb,Fe) alloys are simulated reasonably by using phase-field method. (2) The morphology of the microstructure is mainly controlled by the elastic strain energy induced from the lattice mismatch. In particular, the tetragonal distortion is a key parameter to control and understand the complex microstructure changes.

Phase Field Study of Concurrent Nucleation and Growth in a Diffusion-Controlled Solid-State Phase Transformation

2012 ◽  
Vol 490-495 ◽  
pp. 1140-1144 ◽  
Author(s):  
Gang Wang ◽  
De Chang Zeng ◽  
Zhong Wu Liu
Keyword(s):  
Phase Transformation ◽  
Phase Field ◽  
Phase Field Model ◽  
Field Method ◽  
Nucleation And Growth ◽  
Phase Field Method ◽  
Model Alloy ◽  
Transformation Kinetics ◽  
Diffusion Controlled ◽  
Solid State Phase Transformation

The concurrent nucleation and growth in a diffusion-controlled phase transformation is studied using the quantitative phase field method, and the transformation kinetics is obtained for a model alloy. The simulation results show that the simultaneous nucleation and growth of new phase can be described very well in the phase field model, and that the phase transformation is governed by the diffusion of solute atoms. The competition between nucleation and coarsening is also observed. The phase transformation kinetics is found to obey the JMAK equation.

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