The Microstructure Evolution and Mass Transfer in Mushy Zone during High-Pressure Solidifying Hypoeutectic Al-Ni Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microstructure and Phase Composition
3.2. The Microstructure Evolution of Mushy Zone during High-Pressure Solidification
3.3. The Mass Transfer in the Mushy Zone during Thermal Stabilization Treatment under High Pressure
4. Conclusions
- (1)
- The change of the graphite heater structure is an effective way to fulfill high-pressure mushy-zone solidification.
- (2)
- Non-melted α-Al phase grains, intragranular Ni-rich liquid droplets, and intergranular liquid channels coexist in the mushy zone during thermal stabilization treatment. The black α-Al phase, bright bulk Al3Ni phase, and eutectic structures with different Ni content exist after solidification. Liquid channels disappeared gradually along with the temperature gradient.
- (3)
- Mass transfer was greatly inhibited under high pressure. After thermal stabilization treatment (within 30 min), the migration distance of the liquid pool in the mushy zone at 1 GPa was between 396 μm and 456 μm, while the value was between 9 μm and 216 μm when the pressure was 3 GPa. Furthermore, the minimum time required for a liquid pool to go through the whole mushy zone at 1 GPa and 3 GPa was about 746 h and 5523 h, respectively.
Author Contributions
Funding
Conflicts of Interest
References
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Pressure/GPa | Phase | Al/at% | Ni/at% |
---|---|---|---|
1 | 1 | 85.75 | 14.25 |
2 | 93.54 | 6.46 | |
3 | 76.19 | 23.81 | |
3 | 1 | 83.96 | 16.04 |
2 | 91.90 | 8.10 | |
3 | 76.17 | 23.83 |
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Wang, X.; Dong, D.; Zhu, D.; Wang, H.; Wei, Z. The Microstructure Evolution and Mass Transfer in Mushy Zone during High-Pressure Solidifying Hypoeutectic Al-Ni Alloy. Appl. Sci. 2020, 10, 7206. https://doi.org/10.3390/app10207206
Wang X, Dong D, Zhu D, Wang H, Wei Z. The Microstructure Evolution and Mass Transfer in Mushy Zone during High-Pressure Solidifying Hypoeutectic Al-Ni Alloy. Applied Sciences. 2020; 10(20):7206. https://doi.org/10.3390/app10207206
Chicago/Turabian StyleWang, Xiaohong, Duo Dong, Dongdong Zhu, Hongwei Wang, and Zunjie Wei. 2020. "The Microstructure Evolution and Mass Transfer in Mushy Zone during High-Pressure Solidifying Hypoeutectic Al-Ni Alloy" Applied Sciences 10, no. 20: 7206. https://doi.org/10.3390/app10207206
APA StyleWang, X., Dong, D., Zhu, D., Wang, H., & Wei, Z. (2020). The Microstructure Evolution and Mass Transfer in Mushy Zone during High-Pressure Solidifying Hypoeutectic Al-Ni Alloy. Applied Sciences, 10(20), 7206. https://doi.org/10.3390/app10207206