Phase Field Simulation of Precipitation on Edge Dislocation

2013 ◽  
Vol 785-786 ◽  
pp. 1278-1281
Author(s):  
Ying Jun Gao ◽  
Tian Xia Zhu ◽  
Wen Quan Zhou ◽  
Chuang Gao Huang
Keyword(s):  
Edge Dislocation ◽  
Phase Field ◽  
Elastic Strain Energy ◽  
Field Method ◽  
Phase Field Method ◽  
Second Phase ◽  
Free Energy Function ◽  
Dislocation Interaction ◽  
Phase Nucleation ◽  
Good Agreement

The second phase nucleation and precipitation around an edge dislocation are studied using phase field method. A new free energy function including the elastic strain energy is established to describe the dislocation interaction with the solute. The results give the distribution of strain field of dislocation and show the precipitates grow up according to the power growth law with the index 2. The simulated results are in good agreement with that of theory of non-uniform nucleation.

Phase Field Model for Influence of Edge Dislocation on Precipitation

2011 ◽  
Vol 415-417 ◽  
pp. 1482-1485
Author(s):  
Chuang Gao Huang ◽  
Ying Jun Gao ◽  
Li Lin Huang ◽  
Jun Long Tian
Keyword(s):  
Edge Dislocation ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Field Method ◽  
Phase Field Method ◽  
Second Phase ◽  
Free Energy Function ◽  
Phase Nucleation ◽  
Good Agreement

The second phase nucleation and precipitation around the edge dislocation are studied using phase-field method. A new free energy function is established. The simulation results are in good agreement with that of theory of dislocation and theory of non-uniform nucleation.

Atomic Interchange Potentials Calculation of Ni-Al-Cr Alloy Based on Microscopic Phase Field Method

2013 ◽  
Vol 747-748 ◽  
pp. 739-746
Author(s):  
Wei Ping Dong ◽  
Zhang Jing ◽  
Zheng Chen
Keyword(s):  
Field Theory ◽  
Phase Field ◽  
Nearest Neighbor ◽  
Field Method ◽  
Phase Field Method ◽  
Precipitation Process ◽  
Atomic Interaction ◽  
Long Range Order ◽  
Nearest Neighbour ◽  
Good Agreement

The effects of increasing atomic interchange potentials to the precipitation process and microstructure of Ni-Al-Cr alloy have been simulated based on the microscopic phase field theory. The first nearest neighbour atomic interchange potentials of Ni-Al-Cr alloys for L12 and D022 phase was calculated out according to the formula which were referenced on the relation equation between atomic interchange potentials and long range order parameters by Khachaturyan. The results indicated that Ni-Al (WNi-Al) and Ni-Cr (WNi-Cr) s first nearest neighbor atomic interaction potentials will increase linearly while the temperatures rose. Moreover WNi-Al increased but WNi-Cr decreased roughly linearly if Al atoms concentration rose, and conversely inversed. In addition, these atomic interchange potentials changing with temperature and concentration were in good agreement with earlier study.

scholarly journals Numerical simulation of drop impingement and bouncing on a heated hydrophobic surface

2021 ◽  
Vol 2116 (1) ◽  
pp. 012073
Author(s):  
N. Samkhaniani ◽  
H. Marschall ◽  
A. Stroh ◽  
B. Frohnapfel ◽  
M. Wörner
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Phase Field ◽  
Weber Number ◽  
Hydrophobic Surface ◽  
Field Method ◽  
Phase Field Method ◽  
Cooling Effectiveness ◽  
Experimental Values ◽  
Good Agreement

Abstract The heat transfer of a single water droplet impacting on a heated hydrophobic surface is investigated numerically using a phase field method. The numerical results of the axisymmetric computations show good agreement with the dynamic spreading and subsequent bouncing of the drop observed in an experiment from literature. The influence of Weber number on heat transfer is studied by varying the drop impact velocity in the simulations. For large Weber numbers, good agreement with experimental values of the cooling effectiveness is obtained whereas for low Weber numbers no consistent trend can be identified in the simulations.

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.

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