Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric
Abstract
:1. Introduction
2. Principle and Mechanisms
3. Experimental Methods
3.1. Experimental Procedure
3.2. Experimental Materials and Measurements
4. Results and Discussion
4.1. Discharge Waveforms Comparison of EDM and PMEDM
4.2. Influence of Machining Process Parameters on the Material Removal Rate
4.3. Influence of Machining Process Parameters on the Surface Roughness
4.4. Surface Morphology of the EDM-Treated TiNi SMA
4.5. Influence of Micro-EDM Parameters on the Recast Layer
4.6. Effect of Compound Composition on Microhardness
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Work Conditions | Description |
---|---|
Workpiece material | TiNi SMA |
Electrode material | Brass (C2680) |
Polarity | Positive |
Dielectric fluid | Deionized water |
Additive | TiC (2 μm) |
Concentrations (g/L) | 0, 3, 5, 7, 10 |
Duty (%) | 50 |
Pulse durations (ms) | 1, 4, 7, 10 |
Machining voltages (V) | 60, 80, 100, 120 |
Cavity depth (mm) | 100 |
Element | Ni | Ti | Nb | C | O | Other |
---|---|---|---|---|---|---|
Wt.% | 50.9 | 48.9 | 0.025 | 0.036 | 0.043 | <0.025 |
Workpiece Material | TiNi SMA |
---|---|
Density (kg/m3) | 6450 |
Melting point (°C) | 1310 |
Electrical resistivity (μΩ·m) | 820 |
Modulus of elasticity (MPa) | 42.3 × 103 |
Coefficient of thermal expansion (/°C) | 11 × 10−6 |
Ultimate tensile strength (MPa) | 880 |
Total elongation (%) | 16 |
Property | Value |
---|---|
Density (kg/m3) | 4930 |
Melting point (°C) | 3140 |
Thermal conductivity (W/m·K) | 21 |
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Zhu, Z.; Guo, D.; Xu, J.; Lin, J.; Lei, J.; Xu, B.; Wu, X.; Wang, X. Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric. Micromachines 2020, 11, 1018. https://doi.org/10.3390/mi11111018
Zhu Z, Guo D, Xu J, Lin J, Lei J, Xu B, Wu X, Wang X. Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric. Micromachines. 2020; 11(11):1018. https://doi.org/10.3390/mi11111018
Chicago/Turabian StyleZhu, Ziliang, Dengji Guo, Jiao Xu, Jianjun Lin, Jianguo Lei, Bin Xu, Xiaoyu Wu, and Xujin Wang. 2020. "Processing Characteristics of Micro Electrical Discharge Machining for Surface Modification of TiNi Shape Memory Alloys Using a TiC Powder Dielectric" Micromachines 11, no. 11: 1018. https://doi.org/10.3390/mi11111018