Microstructure and Mechanical Properties of the Powder Metallurgy Nb-16Si-24Ti-2Al-2Cr Alloy
Abstract
:1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusions
- (1)
- The alloys sintered at temperatures below 1400 °C consist of Nbss, Nb3Si and Nb5Si3 phases. When the sintering temperature reaches 1450 °C, the Nb3Si phase is completely decomposed into Nbss and Nb5Si3 phases. Meanwhile, the microstructure coarsens significantly.
- (2)
- With the increase in sintering temperature, the fracture toughness first increases and then decreases, while the yield strength decreases slightly. The fracture toughness of the alloy sintered at 1400 °C reaches 20.2 MPa·m1/2, exceeding the application threshold. Meanwhile, the fracture toughness of the HP alloy is nearly 1.34 times that of the cast alloy.
- (3)
- The main reason for the highest fracture toughness is attributed to the decomposition of the large-sized brittle Nb3Si phase and the formation of a fine microstructure, which greatly increases the number of phase interfaces and improves the chance of crack deflection. In addition, the reduction in the size and content of silicides also reduces their plastic constraints on the ductile Nbss phase.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Wen, F.; Liu, W.; Fu, A.; Huang, Q.; Wang, J.; Cao, Y.; Qiu, J.; Liu, B. Microstructure and Mechanical Properties of the Powder Metallurgy Nb-16Si-24Ti-2Al-2Cr Alloy. Materials 2024, 17, 4155. https://doi.org/10.3390/ma17164155
Wen F, Liu W, Fu A, Huang Q, Wang J, Cao Y, Qiu J, Liu B. Microstructure and Mechanical Properties of the Powder Metallurgy Nb-16Si-24Ti-2Al-2Cr Alloy. Materials. 2024; 17(16):4155. https://doi.org/10.3390/ma17164155
Chicago/Turabian StyleWen, Feng, Wentao Liu, Ao Fu, Qianli Huang, Jian Wang, Yuankui Cao, Jingwen Qiu, and Bin Liu. 2024. "Microstructure and Mechanical Properties of the Powder Metallurgy Nb-16Si-24Ti-2Al-2Cr Alloy" Materials 17, no. 16: 4155. https://doi.org/10.3390/ma17164155