Effects of Annealing on the Residual Stress in γ-TiAl Alloy by Molecular Dynamics Simulation
Abstract
:1. Introduction
2. Simulation Details
2.1. Interatomic Potential
2.2. Molecular Dynamics (MD) Model
2.3. Definition of Residual Stress
3. Results
3.1. Structural Evolution in Annealing
3.2. Microdefects Evolution during the Annealing
3.3. Residual Stress Distribution after Annealing with Different Parameters
4. Conclusions
- (1)
- The grain boundary volume expands when the temperature rises, and the grains are compressed. The volume of the grain boundary shrinks when the temperature is dropped, and the grain size slightly increases after annealing. There is no phase transition during annealing, but the atoms’ distortion occurs with the change of temperature.
- (2)
- There are some atom clusters in the grains, with a few point defect and dislocations, and the main defects at the grain boundaries are different types of dislocation after prepressing. The point defect concentration increases with the rise of temperature and vice versa. The atom clusters have a certain adsorption effect on the atoms that precipitated from the grain boundaries. The higher the annealing temperature, the less the point defects in the grain after annealing.
- (3)
- The distribution of residual stress in the X direction fluctuates slightly. In the Y direction, the higher the annealing temperature, the smaller the average residual stress, and the same annealing temperature can obtain smaller average residual stress after annealing at a slower cooling rate. In the Y and Z directions, the average residual stress after annealing in all four cases is less than the average residual stress after prepressing; the reason for this phenomenon is the grain boundary volume shrinkage and plastic deformation of the grain boundaries increases during cooling, and stress is released.
Author Contributions
Funding
Conflicts of Interest
References
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Case | Annealing Temperature (K) | Heating Rate (K/ps) | Cooling Rate (K/ps) | Holding Temperature (K) |
---|---|---|---|---|
1 | 700 | 2 | 2 | 700 |
2 | 700 | 2 | 1 | 700 |
3 | 900 | 2 | 2 | 700, 900 |
4 | 1100 | 2 | 2 | 700, 1100 |
Case | Annealing Temperature (K) | Dislocation Density (Å−2) |
---|---|---|
1 | 700 | 0.0031 |
2 | 700 | 0.00278 |
3 | 900 | 0.0031 |
4 | 1100 | 0.00281 |
prepressing | / | 0.00248 |
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Feng, R.; Song, W.; Li, H.; Qi, Y.; Qiao, H.; Li, L. Effects of Annealing on the Residual Stress in γ-TiAl Alloy by Molecular Dynamics Simulation. Materials 2018, 11, 1025. https://doi.org/10.3390/ma11061025
Feng R, Song W, Li H, Qi Y, Qiao H, Li L. Effects of Annealing on the Residual Stress in γ-TiAl Alloy by Molecular Dynamics Simulation. Materials. 2018; 11(6):1025. https://doi.org/10.3390/ma11061025
Chicago/Turabian StyleFeng, Ruicheng, Wenyuan Song, Haiyan Li, Yongnian Qi, Haiyang Qiao, and Longlong Li. 2018. "Effects of Annealing on the Residual Stress in γ-TiAl Alloy by Molecular Dynamics Simulation" Materials 11, no. 6: 1025. https://doi.org/10.3390/ma11061025