Strengthening Mechanism and Damping Properties of SiCf/Al-Mg Composites Prepared by Combining Colloidal Dispersion with a Squeeze Melt Infiltration Process
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Fabrication of SiCf/Al-Mg Composites
2.3. Characterization
3. Results and Discussion
3.1. Microstructure
3.2. Phase Analysis
3.3. Mechanical Properties
3.3.1. Hardness
3.3.2. Flexural Strength
3.4. Fracture Morphology Analysis
3.5. Damping Behavior
3.5.1. Damping Capacity at Room Temperature
3.5.2. Damping Capacity at Elevated Temperatures
4. Conclusions
- (1)
- SiCf/Al-Mg composites exhibit a homogeneous distribution of SiC fibers and a high relative density (higher than 97%) when the mass fraction of Mg is less than 20%. Mg could dissolve into the Al matrix, forming the Al12Mg17 precipitate phase. Fibers are well bonded with the Al-Mg matrix and no obvious reactive phase is present at the fiber–matrix interface.
- (2)
- The Vickers hardness of the composites increases with increasing Mg content, and the highest value is 114.06 HV for SiCf/Al-20Mg, which is 35.56% higher than that of SiCf/Al. The enhanced hardness relates to the strengthening effect caused by the introduction of Mg.
- (3)
- SiCf/Al-10Mg has the best flexural strength and elastic modulus, 372 MPa and 161.7 GPa, but the fracture elongation of the composites decreases with the increase in Mg content. This could be attributed to the strengthened interfacial bonding by the introduction of the Mg element.
- (4)
- The damping capacity of SiCf/Al-Mg shows a weak dependence on the strain when the strain amplitude is lower than 0.001%. And then the damping capacity increases dramatically with an increase in the strain (higher than 0.001%), which is better than the alloys with similar composition, demonstrating that the SiC fiber has a positive effect on improving the damping capacity of the composite.
- (5)
- The temperature-dependent damping capacity of the SiCf/Al-Mg composites reveals that all composites exhibited a tendency towards monotonic increase with testing temperature. Such an increase is more obvious at temperatures beyond 200 °C. This is attributed to the second phase, which forms more strong pinning points and increases the dislocation energy needed to break away from new pinning points.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Composite | SiCf/Al | SiCf/Al-5Mg | SiCf/Al-10Mg | SiCf/Al-15Mg | SiCf/Al-20Mg |
---|---|---|---|---|---|
Bulk density | 2.59 | 2.62 | 2.59 | 2.53 | 2.41 |
Relative density | 96.64% | 98.36% | 98.27% | 97.27% | 94.21% |
Composite | Young’s Modulus (GPa) | Flexural Strength (MPa) |
---|---|---|
SiCf/Al | 114.8 ± 3.6 | 309 ± 9 |
SiCf/Al-5Mg | 125.1 ± 1.0 | 324 ± 12 |
SiCf/Al-10Mg | 161.7 ± 2.0 | 372 ± 16 |
SiCf/Al-15Mg | 160.3 ± 1.7 | 331 ± 10 |
SiCf/Al-20Mg | 162.6 ± 5.6 | 283 ± 19 |
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Lin, G.; Sha, J.; Zu, Y.; Dai, J.; Su, C.; Lv, Z. Strengthening Mechanism and Damping Properties of SiCf/Al-Mg Composites Prepared by Combining Colloidal Dispersion with a Squeeze Melt Infiltration Process. Materials 2024, 17, 1600. https://doi.org/10.3390/ma17071600
Lin G, Sha J, Zu Y, Dai J, Su C, Lv Z. Strengthening Mechanism and Damping Properties of SiCf/Al-Mg Composites Prepared by Combining Colloidal Dispersion with a Squeeze Melt Infiltration Process. Materials. 2024; 17(7):1600. https://doi.org/10.3390/ma17071600
Chicago/Turabian StyleLin, Guanzhang, Jianjun Sha, Yufei Zu, Jixiang Dai, Cheng Su, and Zhaozhao Lv. 2024. "Strengthening Mechanism and Damping Properties of SiCf/Al-Mg Composites Prepared by Combining Colloidal Dispersion with a Squeeze Melt Infiltration Process" Materials 17, no. 7: 1600. https://doi.org/10.3390/ma17071600