High Performance NbMoTa–Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure and Composition
3.2. Mechanical Properties
4. Conclusions
- (1)
- The suitable layer distribution ratio of NbMoTa and Al2O3 was determined to be 3:1. The multilayer composite structure prepared by LDED has no macro cracks or holes. With the addition of Al2O3, the grain size of the NbMoTa–Al2O3 composite structure was smaller and more uniform than the NbMoTa multi-principal alloy;
- (2)
- Precipitated phases exist on the grain boundaries, and the test results show that it may be that during the process of NbMoTa deposition, Ta and the remelted Al2O3 underwent a complex chemical reaction, and finally AlTaO4 was formed;
- (3)
- Al2O3, as a strengthening particle, improved the wear resistance of the sample, which was higher than that of the NbMoTa multi-principal alloy formed by LDED. The resistivity of the specimens was 1.55 × 10−5 Ω × m in the parallel forming direction and 1.29 × 10−7 Ω × m in the perpendicular forming direction.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Laser Power (W) | Scanning Speed (mm/s) | Z-Axis Single Layer Travel (mm) | Overlap Rate (%) | Powder Mass Flows (g/min) | Volume Flow of Auxiliary Gas (L/min) | Volume Flow of ProTective Gas (L/min) |
---|---|---|---|---|---|---|---|
NbMoTa | 550 | 8 | 0.08 | 50 | 2.96 | 5.0 | 4.0 |
Al2O3 | 200 | 8 | 0.08 | 50 | 1.47 | 4.0 | 4.0 |
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Zhang, H.; Chen, Z.; He, Y.; Guo, X.; Li, Q.; Ji, S.; Zhao, Y.; Li, D. High Performance NbMoTa–Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition. Materials 2021, 14, 1685. https://doi.org/10.3390/ma14071685
Zhang H, Chen Z, He Y, Guo X, Li Q, Ji S, Zhao Y, Li D. High Performance NbMoTa–Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition. Materials. 2021; 14(7):1685. https://doi.org/10.3390/ma14071685
Chicago/Turabian StyleZhang, Hang, Zihao Chen, Yaoyao He, Xin Guo, Qingyu Li, Shaokun Ji, Yizhen Zhao, and Dichen Li. 2021. "High Performance NbMoTa–Al2O3 Multilayer Composite Structure Manufacturing by Laser Directed Energy Deposition" Materials 14, no. 7: 1685. https://doi.org/10.3390/ma14071685