Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Fabrication
2.2. Microstructural and Phase Evaluation
2.3. Nanoindentation of Sintered Samples
3. Results and Discussion
3.1. Microstructural and Phase Analysis
3.2. Nanoindentation Analysis of the Mechanical Properties of the Sintered Samples
3.2.1. Nanoindentation Load–Depth and Depth–Time Curves of the Sintered Samples
3.2.2. Nano-Hardness and Elastic Modulus of the Sintered TiAl and TiAl(100−x)-xTaN Composites
3.2.3. Mechanical and Anti-Wear Characteristics of the Sintered TiAl and TiAl(100−x)-xTaN Composites
4. Conclusions
- The TiAl comprises TiAl2, α-Ti, and TiAl phases with a duplex microstructure characterized by homogenous γ and lamellar colonies. With increasing additions of TaN, complex phases were formed, and the microstructure exhibited a typical pseudo-duplex structure;
- The nano-hardness and elastic modulus increased as the TaN addition increased, as the highest values of 12.22 GPa and 241.45 GPa were obtained at the addition of 8 wt.%TaN, respectively. Subsequently, the highest yield strain, yield pressure, and elastic recovery index were demonstrated by the TiAl−8 wt.%TaN composite with values at 0.0665, 0.054 GPa, and 0.3423, respectively. In addition, the composite also demonstrated the lowest plastic index and RPE of 0.6573 and 1.922, respectively;
- The TiAl−8wt.%TaN composites displayed the best mechanical properties. It is proposed that 8 wt.%TaN addition under the specified sintering condition is the optimal concentration for attaining the optimum mechanical properties of TiAl-based composites studied in this work.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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S/N | Powder | Purity (%) | Particle Size (µm) | Source |
---|---|---|---|---|
1 | Ti-48Al-2Cr-2Nb | 99.8 | <36 | TLS Technik, Bitterfeld, Germany |
2 | TaN | 99 | 4–10 | Cerac Inc., Milwaukee, WI, USA |
Sintered Material | Crystallite Size, D (nm) | Lattice Strain, ɛ (%) | |
---|---|---|---|
TiAl | 24.7392 | 3.129 | 0.0016 |
TiAl−2wt.%TaN | 21.4744 | 4.312 | 0.00217 |
TiAl−4wt.%TaN | 21.186 | 6.444 | 0.0022 |
TiAl−6wt.%TaN | 19.104 | 7.303 | 0.00274 |
TiAl−8wt.%TaN | 15.1309 | 13.84 | 0.00437 |
TiAl−10wt.%TaN | 13.510 | 16.271 | 0.00548 |
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Babalola, B.J.; Ayodele, O.O.; Olubambi, P.A. Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature. Materials 2023, 16, 2607. https://doi.org/10.3390/ma16072607
Babalola BJ, Ayodele OO, Olubambi PA. Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature. Materials. 2023; 16(7):2607. https://doi.org/10.3390/ma16072607
Chicago/Turabian StyleBabalola, Bukola Joseph, Olusoji Oluremi Ayodele, and Peter Apata Olubambi. 2023. "Nanoindentation and Structural Analysis of Sintered TiAl(100−x)-xTaN Composites at Room Temperature" Materials 16, no. 7: 2607. https://doi.org/10.3390/ma16072607