Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy
Abstract
:1. Introduction
2. Experimental Procedure
3. Results and Discussion
3.1. Micro-Structure Characterization
3.2. Mechanical Properties
3.3. Fractography
4. Conclusions
- (1)
- The size of Si particles was significantly reduced and Si was distributed more homogeneously within Al-Si alloy.
- (2)
- The mechanical properties were improved significantly by adding Zr. The best results were for Zr content of 2.4 wt %. The tensile strength, compressive strength, shear strength, and hardness of Al-Si alloy with 2.4 wt % Zr reached 231.1 MPa, 343.1 MPa, 174.9 MPa, and 85.5 HV, respectively.
- (3)
- The fracture surface of Al-Si alloy without Zr additive showed a brittle fracture mode and no pits in the surface. When Zr was added, the Al-Si alloys exhibited a typical plastic deformation and a large amount of pits were formed.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Alloy | wt % (Al) | wt % (SiO2) | wt % (Zr) |
---|---|---|---|
Alloy 1 | 90.4 | 9.6 | 0 |
Alloy 2 | 89.5 | 9.5 | 1.0 |
Alloy 3 | 89.1 | 9.4 | 1.5 |
Alloy 4 | 88.2 | 9.4 | 2.4 |
Alloy | Theoretical Density (g/cm3) | Actual Density (g/cm3) |
---|---|---|
Alloy 1 | 2.78 | 2.78 ± 0.02 |
Alloy 2 | 2.80 | 2.82 ± 0.02 |
Alloy 3 | 2.80 | 2.82 ± 0.02 |
Alloy 4 | 2.81 | 2.81 ± 0.02 |
Alloy | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Compressive Strength (MPa) | Shear Strength (MPa) | Hardness (HV) |
---|---|---|---|---|---|---|
Alloy 1 | 211.2 ± 7.2 | 89.1 ± 7.9 | 5.7 ± 0.3 | 299.6 ± 22.6 | 151.6 ± 3.7 | 65.2 ± 7.2 |
Alloy 2 | 224.2 ± 10.2 | 99.1 ± 8.5 | 6.5 ± 0.3 | 337.8 ± 28.8 | 171.3 ± 4.5 | 82.5 ± 10.2 |
Alloy 3 | 221.6 ± 9.0 | 98.4 ± 6.7 | 6.7 ± 0.2 | 330.6 ± 32.3 | 174.7 ± 7.7 | 79.3 ± 9.4 |
Alloy 4 | 231.1 ± 15.4 | 114.6 ± 9.7 | 7.4 ± 0.7 | 343.1 ± 24.4 | 174.9 ± 5.5 | 85.5 ± 11.6 |
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Qian, H.; Zhu, D.; Hu, C.; Jiang, X. Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy. Metals 2018, 8, 124. https://doi.org/10.3390/met8020124
Qian H, Zhu D, Hu C, Jiang X. Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy. Metals. 2018; 8(2):124. https://doi.org/10.3390/met8020124
Chicago/Turabian StyleQian, Hui, Degui Zhu, Chunfeng Hu, and Xiaosong Jiang. 2018. "Effects of Zr Additive on Microstructure, Mechanical Properties, and Fractography of Al-Si Alloy" Metals 8, no. 2: 124. https://doi.org/10.3390/met8020124