Phase stability, microstructure and thermodynamic properties of NbMoZrTiV lightweight high-entropy refractory alloy
The design of light refractory high entropy alloys (LRHEAs) with good high temperature phase stability is important to overcome material failures in high temperature environments such as aerospace. In this paper, the effects of pressure and temperature on the stability and thermodynamic properties o...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424030680 |
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| Summary: | The design of light refractory high entropy alloys (LRHEAs) with good high temperature phase stability is important to overcome material failures in high temperature environments such as aerospace. In this paper, the effects of pressure and temperature on the stability and thermodynamic properties of the NbMoZrTiV LRHEA phase have been investigated using first-principles calculations of density functional theory calculations. Its microstructure and mechanical properties after annealing at different temperatures (600 °C, 800 °C and 1000 °C) have also been studied. Both simulations and experiments show that NbMoZrTiV LRHEA is a single-phase BCC solid solution phase, and all the crystal structures satisfy thermodynamic stability without phase transformation with increasing pressure and temperature. With increasing annealing temperature, the grain size does not change significantly, showing excellent high temperature phase stability. Following prolonged annealing at 600 °C, the microhardness of the alloy reaches a maximum of 667.88 HV0.2. It was observed that as the annealing temperature increased, the residual stresses were gradually released, resulting in a corresponding decrease in alloy hardness. The results of the compression tests show that as the annealing temperature is increased, the yield strength of the alloy initially rises before declining. At an annealing temperature of 600 °C, the alloy exhibits the highest yield strength (1763 MPa) and ultimate compressive strength (2145 MPa). This paper demonstrates the exceptional high-temperature phase stability and mechanical properties of NbMoZrTiV LRHEA through a combination of simulation and experimental methods. It proposes the engineering applications of NbMoZrTiV LRHEA in high temperature fields such as aerospace. |
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| ISSN: | 2238-7854 |