The Role of Deformation and Microstructure Evolution on Texture Formation of a TA15 Alloy Subjected to Plane Strain Compression
Abstract
:1. Introduction
2. Experimental Procedures
3. Results and Discussion
3.1. Texture Evolution Mechanism under Different Deformation Conditions
3.1.1. The Effect of Deformation Amount
3.1.2. The Effect of Deformation Temperature
3.1.3. The Effect of Strain Rate
3.2. Mechanical Properties under Different Deformation Conditions
4. Conclusions
- (1)
- After plane strain compression, the basal texture component appears regardless of different deformation amounts, which is because the massive basal slip activated makes the C-axis of the α grain rotate to the compression axis. With the increase in deformation, the {0001} poles of the α grains first approach the ND and then deviates from the ND. The deviation is due to the inhomogeneous basal slip at a small deformation amount as well as the higher principal strain ratio at a large deformation amount. Meanwhile, both DDRX and CDRX grains are observed, and the dominant DRX mechanism changes from DDRX to CDRX with deformation. However, DRX has little effect on the texture evolution due to a lower fraction of DDRX grains and a similar orientation of CDRX grains to the deformed grain.
- (2)
- With the increase in deformation temperature, the basal texture component first strengthens and then weakens. At a deformation temperature of 800 °C, the dispersive orientation of the α grains may be associated with a smaller amount of activated basal slip since the critical shear stress (CRSS) of this slip is relatively high under this condition. At the temperature of 850 °C, the decrease in CRSS promotes basal slip, so the intensity of the basal texture becomes strong. However, as the deformation increases to 900 °C, the deformation heat effect in this condition may make the temperature in the central region of the sample higher than the beta-transition temperature, so α→β phase transformation occurs during deformation and lamellar α (αl) precipitate during the cooling stage. The occurrence of lamellar α disperses the overall grain orientation; thus, the basal texture feature is obviously weakened. In addition, CDRX also prevails under different temperatures while it has little effect on the texture evolution.
- (3)
- With the increase in strain rate, the orientation of the α grain first comes together and then disperses. At a lower strain rate, the existence of αl is the main reason for the dispersive texture. At a higher strain rate, the operation of other slip systems will increase, beside basal slip, to coordinate faster plastic deformation. Moreover, significant inhomogeneous deformation makes the orientation of the substructure at GBs preferentially rotate, while the substructure in the interior of coarse αp is not fully deformed. Therefore, there is little change in the αp morphology and orientation of coarse αp is rather dispersive. Similarly, CDRX is still most common at different strain rates but its influence on the texture evolution is limited.
- (4)
- Microstructure type is the most critical factor to determine the microhardness of samples after plane strain compression deformation, and the formation of αl can significantly improve the microhardness. As the α grain is mainly equiaxed-type, there is an obvious basal texture component after deformation, and the microhardness is inversely proportional to the grain size. However, as the orientation of equiaxed α is dispersive, the microhardness will be higher due to the lower Schmidt factors of the prism slip activated at room temperature.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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No. | Deformation Temperature (°C) | Strain Rate (s−1) | Deformation Amount (%) |
---|---|---|---|
1 | 800 | 0.01 | 60 |
2 | 850 | 0.01 | 30 |
3 | 850 | 0.01 | 45 |
4 | 850 | 0.01 | 60 |
5 | 900 | 0.01 | 60 |
6 | 900 | 0.1 | 60 |
7 | 900 | 1 | 60 |
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Wang, X.; Jia, X.; Wu, W.; Cheng, J.; Zhao, X.; Shen, M. The Role of Deformation and Microstructure Evolution on Texture Formation of a TA15 Alloy Subjected to Plane Strain Compression. Materials 2024, 17, 3752. https://doi.org/10.3390/ma17153752
Wang X, Jia X, Wu W, Cheng J, Zhao X, Shen M. The Role of Deformation and Microstructure Evolution on Texture Formation of a TA15 Alloy Subjected to Plane Strain Compression. Materials. 2024; 17(15):3752. https://doi.org/10.3390/ma17153752
Chicago/Turabian StyleWang, Xianxian, Xin Jia, Wenhao Wu, Jun Cheng, Xueni Zhao, and Mingjie Shen. 2024. "The Role of Deformation and Microstructure Evolution on Texture Formation of a TA15 Alloy Subjected to Plane Strain Compression" Materials 17, no. 15: 3752. https://doi.org/10.3390/ma17153752