Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting
Abstract
:1. Introduction
2. Experimental Procedures
2.1. Magnesium Alloy and Experimental Set-Up
2.2. Casting Procedure and Samples Characterization
2.3. Mechanical Properties Tests and Segregation Rate Detection
3. Results and Discussion
3.1. Microstructure Refinement by Different Ultrasonic Treatments
- (1)
- at the liquid-air interfaces corresponding to a total reflection condition as soft walls;
- (2)
- at the side walls of the horn which represents hard walls;
- (3)
- at the horn tip, where is the amplitude of the wave, is the initial frequency of the wave, is the changing frequency of wave frequency;
- (4)
- at the walls of the crystallizer and liquid cave which represents the impedance boundary condition and is the acoustic input impedance of the external.
3.2. Mechanical Properties and Segregation
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Element | Zn | Zr | Fe | Cu | Si | Ni | Mg |
---|---|---|---|---|---|---|---|
wt % | 5.720 | 0.644 | 0.018 | 0.013 | 0.026 | 0.010 | Balance |
Name | Value | Description |
---|---|---|
1820 kg/m3 | Density of magnesium alloy | |
4000 m/s | Speed of sound in magnesium alloy | |
0.0279 dB/cm | Attenuation coefficient | |
20 kHz | Initial frequency of the wave | |
200 Hz | Changing frequency of wave frequency | |
3.2 106 Pa | Source pressure amplitude | |
4.2 107 Pa· s/m | Acoustic input impedance |
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Chen, X.; Le, Q.; Wang, X.; Liao, Q.; Chu, C. Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting. Metals 2017, 7, 173. https://doi.org/10.3390/met7050173
Chen X, Le Q, Wang X, Liao Q, Chu C. Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting. Metals. 2017; 7(5):173. https://doi.org/10.3390/met7050173
Chicago/Turabian StyleChen, Xingrui, Qichi Le, Xibo Wang, Qiyu Liao, and Chaoyang Chu. 2017. "Variable-Frequency Ultrasonic Treatment on Microstructure and Mechanical Properties of ZK60 Alloy during Large Diameter Semi-Continuous Casting" Metals 7, no. 5: 173. https://doi.org/10.3390/met7050173