Version 1
: Received: 15 December 2023 / Approved: 15 December 2023 / Online: 19 December 2023 (04:45:10 CET)
How to cite:
Wang, F.; Guo, J.; Zhang, S.; Zhou, Y.; Zhu, L. Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy. Preprints2023, 2023121165. https://doi.org/10.20944/preprints202312.1165.v1
Wang, F.; Guo, J.; Zhang, S.; Zhou, Y.; Zhu, L. Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy. Preprints 2023, 2023121165. https://doi.org/10.20944/preprints202312.1165.v1
Wang, F.; Guo, J.; Zhang, S.; Zhou, Y.; Zhu, L. Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy. Preprints2023, 2023121165. https://doi.org/10.20944/preprints202312.1165.v1
APA Style
Wang, F., Guo, J., Zhang, S., Zhou, Y., & Zhu, L. (2023). Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy. Preprints. https://doi.org/10.20944/preprints202312.1165.v1
Chicago/Turabian Style
Wang, F., Yifan Zhou and Lin Zhu. 2023 "Effect of High-Frequency Electric Pulse on the Solidification Microstructure and Properties of Hypoeutectic Al-Si Alloy" Preprints. https://doi.org/10.20944/preprints202312.1165.v1
Abstract
The effects of different pulse frequencies on the microstructure grain size and solid solubility of Al-9Si alloy were systematically investigated using OM, SEM, and EDS. The effects on the mechanical properties of the alloy were analyzed using micro-Vickers hardness tester and multifunctional friction tester. During the solidification process, the Al-9Si alloy is exposed to high-frequency electric current pulses with a current density of 300A/cm2 and frequencies of 0Hz, 500Hz, 1 000Hz, and 2 000Hz. The experimental results show that as the high-frequency pulse frequency increases, the Lorentz force also increases. The intense electromagnetic stirring leads to grain refinement. However, as the pulse frequency continues to increase, the combined effect of Joule heating and Lorentz force results in an enlargement of the melt zone and an increase in grain size. At a pulse frequency of 1 000Hz, the eutectic structure size of the Al-9Si alloy is optimal, with the average size reduced to 13.87μm and a dense distribution, effectively eliminating primary Si. The EDS results revealed that the high-frequency pulse led to a more uniform distribution of Si elements within the matrix, and the solid solubility of Si in the α-Al matrix increased to a maximum value of 1.99%, representing a 39.2% increase. At a pulse frequency of 1 000Hz, the sample demonstrates the most favorable mechanical properties, with the friction coefficient reaching a minimum value of 0.302, representing a 37.7% decrease in the average friction coefficient. The results demonstrate that high-frequency pulsing is an effective method for enhancing the mechanical properties of Al-9Si alloy.
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
