Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Quasi-Static Compression
2.3. High Strain Rate Compression
2.4. Failure Analysis
2.5. Dynamic Mechanical Analysis
2.6. Thermo-Mechanical Analysis
3. Results and Discussion
3.1. Microstructure
3.2. Quasi-Static Compression
Sample type | Measured density (g/cm3) | Compressive strength (MPa) | Specific compressive strength (MPa/(g/cm3)) | Plateau stress (MPa) | Densification strain (mm/mm) |
---|---|---|---|---|---|
S1 | 1.71 ± 0.06 | 152.4 ± 4.3 | 89.1 ± 2.0 | 103.0 ± 7.2 | 0.44 ± 0.01 |
S2 | 1.84 ± 0.03 | 161.1 ± 7.8 | 87.4 ± 4.3 | 109.0 ± 4.1 | 0.41 ± 0.02 |
3.3. High Strain Rate Compression
3.4. Dynamic Mechanical Analysis
Sample | Storage modulus (GPa) (50, 200, 400 °C) | Loss modulus (GPa) (50, 200, 400 °C) | tanδ (50, 200, 400 °C) |
---|---|---|---|
S1 | 47.45, 37.69, 25.79 | 0.70, 1.04, 3.22 | 0.015, 0.028, 0.125 |
S2 | 48.88, 32.57, 17.84 | 0.90, 1.39, 2.40 | 0.018, 0.043, 0.134 |
A356 | 69.22, 63.42, 48.07 | 0.98, 1.19, 5.79 | 0.014, 0.019, 0.120 |
3.5. Thermomechanical Analysis
Sample | CTE (100–200 °C) (μm/m°C) | CTE (300–400 °C) (μm/m°C) | Mean CTE (μm/m°C) |
---|---|---|---|
S1 | 11.67 ± 0.42 | 16.35 ± 0.66 | 14.60 ± 0.91 |
S2 | 12.70 ± 0.36 | 17.61 ± 0.40 | 15.74 ± 0.74 |
4. Conclusions
- The S1 and S2 type specimens had average densities of 1.71 and 1.84 g/cm3, respectively. The compressive strength of higher density foam was higher. The compressive strength of S1 and S2 syntactic foams was measured as 152.4 and 161.1 MPa, respectively.
- A356/SiCHP syntactic foams did not show strain rate sensitivity in the range studied in the present work for both the S1 type and S2 type.
- The S1 and S2 type syntactic foams had specific quasi-static compressive strength of 89.1 and 87.4 MPa/(g/cm3), respectively, and a specific high strain rate compressive strength of 81.2 and 76.1 MPa/(g/cm3), respectively.
- The failure at high strain rate is initiated from the particle cracking and shear band formation in the matrix. A large compressive strain can be obtained in syntactic foams before densification because of a high volume fraction of porosity in the microstructure.
- The DMA testing showed that the storage modulus of syntactic foams is lower than that of the matrix alloy. It is also observed that the storage modulus of alloy decreases rapidly above a transition temperature, whereas the rate of decrease of storage modulus was nearly the same for syntactic foams in the test temperature range. Syntactic foams had a higher loss modulus than the matrix alloy at low temperatures. Due to the lack of viscoelasticity in metals, the storage modulus of the alloy was nearly the same as the elastic modulus and the loss modulus was comparatively negligible (two orders of magnitude lower).
- Syntactic foams had lower CTE compared to the matrix alloy. The syntactic foam demonstrated a higher CTE values at higher temperature.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Cox, J.; Luong, D.D.; Shunmugasamy, V.C.; Gupta, N.; Strbik, O.M., III; Cho, K. Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams. Metals 2014, 4, 530-548. https://doi.org/10.3390/met4040530
Cox J, Luong DD, Shunmugasamy VC, Gupta N, Strbik OM III, Cho K. Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams. Metals. 2014; 4(4):530-548. https://doi.org/10.3390/met4040530
Chicago/Turabian StyleCox, James, Dung D. Luong, Vasanth Chakravarthy Shunmugasamy, Nikhil Gupta, Oliver M. Strbik, III, and Kyu Cho. 2014. "Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams" Metals 4, no. 4: 530-548. https://doi.org/10.3390/met4040530