Inhomogeneous Microstructure Evolution of 6061 Aluminum Alloyat High Rotating Speed Submerged Friction Stir Processing
Abstract
:1. Introduction
2. Materials and Experimental Setup
2.1. Material Preparation
2.2. The Microstructure and Mechanical Properties Analysis
3. Results
3.1. Processing Thermal Cycle Curve
3.2. Mechanical Property
3.3. EBSD Analysis
3.3.1. Grain Size and Misorientation Angle Distribution Statistics
3.3.2. Qualitative and Quantitative Statistics of Texture
3.3.3. Dislocation Distribution in Grain-Based and Kernel-Based Level
3.3.4. Processing Boundary Analysis
3.3.5. Further Analysis of SZ-2 Microstructure
3.4. TEM Analysis
4. Discussion
4.1. Microstructure Evolution in the Processing Zone
4.2. The Mechanism of Strengthen
4.2.1. Grain Boundary Strengthening
4.2.2. Dislocation Strengthening
4.2.3. Precipitation Phase Strengthening
4.2.4. Solid Solution Strengthening
4.3. The Synergy of Strength and Ductility
5. Conclusions
- HRS-SFSP processing zone shows excellent mechanical properties and overcomes the contradiction between strength and ductility. The strength and ductility of 6061 aluminum alloy are increased by 48.7% and 10.2% respectively compared with BM. This was credited to the plastic–elastic interface generated by the inhomogeneous structure in the processing zone.
- The plastic–elastic interface is composed of deformed grains and recrystallized grains. Deformed grains produce dislocation gradients by affecting the distribution of dislocations and promote the initiation of more slip systems. Meanwhile, the recrystallization proportions in SZ-1, SZ-2 and SZ-3 are 14.3%, 37.8% and 35.9% respectively, which provide sufficient plasticity for aluminum alloy. These can facilitate strain hardening and improved ductility and are composed of deformed grains and recrystallized grains. Deformed grains produce dislocation gradients by affecting the distribution of dislocations and promote the initiation of more slip systems. Meanwhile, the recrystallization proportions in SZ-1, SZ-2 and SZ-3 are 14.3%, 37.8% and 35.9% respectively, which provide sufficient plasticity for aluminum alloy. These can facilitate strain hardening and improved ductility.
- The recrystallization mechanism at different locations in the processing zone is different. GDRX and CDRX are dominant in SZ-1 and SZ-3, while CDRX and DDRX are dominant in SZ-2. The transformation of recrystallization mechanism is also an important factor affecting the evolution of microstructures.
- The difference of mechanical properties in the processing zone comes from the difference of grain size, dislocation density, second phase distribution and solid solubility. The grain boundary strengthening and the second phase strengthening are the main ones. Meanwhile, the uniformly distributed and fine second phase promotes the plastic–elastic interface effect.
- HRS-SFSP is a modified version of FSP. Although the use of small size tools may affect the processing efficiency, the mechanical properties of aluminum alloys are significantly improved. Therefore, it is recommended to apply it in industry.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Element | Mg | Si | Fe | Mn | Cu | Al |
---|---|---|---|---|---|---|
content | 1.16 | 0.66 | 0.4 | 0.2 | 0.22 | Bal. |
Location | ψ1 | Φ | ψ2 | Number Fraction | Taylor Factor |
---|---|---|---|---|---|
SZ-1 | 0° | 0° | 0° | 0.032 | 2.813 |
35° | 45° | 0° | 0.083 | ||
90° | 35° | 45° | 0.007 | ||
0° | 45° | 0° | 0.019 | ||
SZ-2 | 0° | 0° | 0° | 0.045 | 2.933 |
35° | 45° | 0° | 0.030 | ||
90° | 35° | 45° | 0.048 | ||
0° | 45° | 0° | 0.044 | ||
SZ-3 | 0° | 0° | 0° | 0.028 | 2.907 |
35° | 45° | 0° | 0.021 | ||
90° | 35° | 45° | 0.084 | ||
0° | 45° | 0° | 0.024 |
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Peng, Y.; Xie, Z.; Su, C.; Zhong, Y.; Tao, Z.; Zhuang, D.; Zeng, J.; Tang, H.; Xu, Z. Inhomogeneous Microstructure Evolution of 6061 Aluminum Alloyat High Rotating Speed Submerged Friction Stir Processing. Materials 2023, 16, 579. https://doi.org/10.3390/ma16020579
Peng Y, Xie Z, Su C, Zhong Y, Tao Z, Zhuang D, Zeng J, Tang H, Xu Z. Inhomogeneous Microstructure Evolution of 6061 Aluminum Alloyat High Rotating Speed Submerged Friction Stir Processing. Materials. 2023; 16(2):579. https://doi.org/10.3390/ma16020579
Chicago/Turabian StylePeng, Yuchen, Zonghua Xie, Changchao Su, Yuefang Zhong, Zushan Tao, Dongyang Zhuang, Jiahui Zeng, Hongqun Tang, and Zhengbing Xu. 2023. "Inhomogeneous Microstructure Evolution of 6061 Aluminum Alloyat High Rotating Speed Submerged Friction Stir Processing" Materials 16, no. 2: 579. https://doi.org/10.3390/ma16020579