Effects of CeO2 on the Si Precipitation Mechanism of SiCp/Al-Si Composite Prepared by Powder Metallurgy
Abstract
:1. Introduction
2. Experimental Process
3. Results and Discussion
3.1. The XRD Analysis of SiCp/Al-Si Composites with Different CeO2 Contents
3.2. Effect of CeO2 Additions on the Microstructure of SiCp/Al-Si Composites
3.3. Influence Mechanism of CeO2 on the Microstructure of SiCp/Al-Si Composites
3.4. Calculation of Nucleation Rate of Precipitated Si in Composites
4. Conclusions
- (1)
- SiCp/Al-Si composites with different CeO2 contents were successfully prepared by a powder metallurgy method. When the content of CeO2 is less than 0.6 wt%, CeO2 mainly exists in the form of discrete particles and when the content of CeO2 is more than 0.6 wt%, the agglomeration of CeO2 increases.
- (2)
- An appropriate amount of CeO2 can obviously refine the size of precipitated Si particles and increase the amount of Si particles. With the increase of CeO2 content from 0 to 1.8 wt%, the number of precipitated Si particles first increases and then decreases, and the average size of precipitated Si particles first increases and then decreases, too. When the CeO2 content is 0.6 wt%, the number of Si particles precipitated in the composites is the largest and the average size is the smallest.
- (3)
- For the composite without CeO2, the nucleation of precipitated Si is mainly based on Al matrix. The addition of CeO2 can be used as the heterogeneous nucleation substrate for precipitated Si, which improves the nucleation rate of precipitated Si. Moreover, the nucleation rate of precipitated Si on CeO2 substrate is higher than that on Al substrate, which further improves the nucleation rate of precipitated Si, thus increasing the number of precipitated Si particles and refining the size of precipitated Si particles.
Author Contributions
Funding
Conflicts of Interest
References
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Phase | Melting Point (K) | Crystal Structure | Lattice Constant (Å) |
---|---|---|---|
Si | 1673 | FCC | 0.6636 |
CeO2 | 2873 | FCC | 0.5411 |
Al | 933 | FCC | 0.4050 |
Parameter Value | Nucleation Substrates | ||
---|---|---|---|
Al Matrix | CeO2 | ||
ΔGv | (J/cm3) | 104 | 104 |
ΔGA | (J) | 2.19 × 10−19 | 2.19 × 10−19 |
ΔGsi | (J/cm3) | 0 | 15 |
N0 | ((s·cm3)−1) | 3.94 × 1021 | 3.94 × 1021 |
γi | (J/cm2) | 4 × 10−6 | 6 × 10−6 |
σi | (J/cm2) | 1 × 10−4 | 5 × 10−5 |
k | (J/k) | 1.38 × 10−23 | 1.38 × 10−23 |
h | (J·s) | 6.62 × 10−34 | 6.62 × 10−34 |
T | (K) | 823 | 823 |
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Yang, B.; Wang, A.; Liu, K.; Liu, C.; Xie, J.; Wang, G.; Wei, S. Effects of CeO2 on the Si Precipitation Mechanism of SiCp/Al-Si Composite Prepared by Powder Metallurgy. Materials 2020, 13, 4365. https://doi.org/10.3390/ma13194365
Yang B, Wang A, Liu K, Liu C, Xie J, Wang G, Wei S. Effects of CeO2 on the Si Precipitation Mechanism of SiCp/Al-Si Composite Prepared by Powder Metallurgy. Materials. 2020; 13(19):4365. https://doi.org/10.3390/ma13194365
Chicago/Turabian StyleYang, Bin, Aiqin Wang, Kunding Liu, Chenlu Liu, Jingpei Xie, Guangxin Wang, and Shizhong Wei. 2020. "Effects of CeO2 on the Si Precipitation Mechanism of SiCp/Al-Si Composite Prepared by Powder Metallurgy" Materials 13, no. 19: 4365. https://doi.org/10.3390/ma13194365