Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructural Characterization
3.2. Mechanical Properties
3.3. Corrosion Behavior
4. Conclusions
- The microstructure of the as-cast MMCs consist of α-Mg matrix and LPSO phase distributed discontinuously along the grain boundary. SiC particles are located in the vicinity of the LPSO phase.
- The LPSO phase is observed in the as-cast MMCs. The addition of SiC particles does not inhibit the formation of the LPSO phase in the MMCs during solidification.
- Grain refinement of Mg is observed in the MMCs, which is beneficial to mechanical properties. The addition of SiC has no influence on the morphology and distribution of the LPSO phase. The grain size strengthening and dispersion strengthening brought by SiC enhance the strength of MMC but reduce elongation. Increasing amounts of SiC do not significantly improve the mechanical properties, which is a result of the clustering of SiC particles.
- SiC has a deleterious effect on the corrosion resistance of WZ73 alloy. The results of the immersion test of SiC in 1 wt % NaCl solution indicate the MMCs has a higher corrosion rate. In the WZ73-SiC MMCs, SiC shows an indirect effect on the microgalvanic corrosion. The increased corrosion rate observed in MMCs is due to the presence of the Mg matrix/SiC interface in the vicinity of the LPSO phase, which breaks the continuity of the matrix, and accelerates the corrosion rate.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | Zone | Element | |||||
---|---|---|---|---|---|---|---|
Mg | Y | Zn | Si | C | O | ||
WZ73 | 1 | 98.2 | 1.2 | 0.7 | - | - | - |
2 | 89.1 | 6.4 | 4.6 | - | - | - | |
WZ73-1.5 vol % SiC | 1 | 98.8 | 0.9 | 0.3 | - | - | - |
2 | 90.0 | 5.8 | 4.2 | - | - | - | |
3 | 1.4 | - | - | 47.8 | 50.8 | - | |
4 | 98.0 | 1.4 | 0.6 | - | - | - | |
5 | 48.5 | 22.4 | - | 18.7 | - | 10.4 | |
WZ73-2.5 vol % SiC | 1 | 99.3 | 0.3 | 0.4 | - | - | - |
2 | 90.1 | 5.3 | 4.5 | ||||
3 | 1.1 | - | - | 42.4 | 56.5 | - | |
4 | 98.2 | 0.9 | 0.9 | - | - | - | |
5 | 36.3 | 25.9 | - | 23.8 | - | 14.0 |
Sample | α-Mg (%) | LPSO (%) | Grain Size of α-Mg(µm) | YS (MPa) | UTS (MPa) | Elongation (%) |
---|---|---|---|---|---|---|
WZ73 | 77.2 | 22.8 | 143 | 126 ± 13 | 172 ± 9 | 9 ± 1 |
WZ73-1.5 vol % SiC | 80.3 | 19.7 | 118 | 160± 1 | 223 ± 8 | 6 ± 2 |
WZ73-2.5 vol % SiC | 84.1 | 15.9 | 114 | 154 ± 9 | 238 ± 9 | 7± 1 |
Sample | α-Mg | α-Mg (Near Particles) | LPSO |
---|---|---|---|
WZ73 | 77 ± 3 | - | 115 ± 6 |
WZ73-1.5 vol % SiC | 81 ± 9 | 86 ± 13 | 121 ± 5 |
WZ73-2.5 vol % SiC | 79 ± 5 | 89 ± 8 | 119 ± 5 |
Sample | Mass Loss (mg/cm2) | Corrosion Rate (mm/year) |
---|---|---|
WZ73 | 6.3 | 16 |
WZ73-1.5 vol % SiC | 13.8 | 27 |
WZ73-2.5 vol % SiC | 12.8 | 25 |
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Chiu, C.; Liu, H.-C. Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method. Metals 2018, 8, 424. https://doi.org/10.3390/met8060424
Chiu C, Liu H-C. Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method. Metals. 2018; 8(6):424. https://doi.org/10.3390/met8060424
Chicago/Turabian StyleChiu, Chun, and Hsu-Chieh Liu. 2018. "Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method" Metals 8, no. 6: 424. https://doi.org/10.3390/met8060424