Journal
FRONTIERS IN MATERIALS
Volume 7, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2020.00172
Keywords
refractory medium-entropy alloy; mechanical properties; microstructure; thermal expansion; low-density alloy
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Funding
- National Natural Science Foundation of China [51971123]
- Natural Science Foundation of Shanghai [17ZR1440800]
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Low-density refractory medium entropy alloys (NbTiVZr, Nb(0.)5TiVZr, and NbTiV) were produced by vacuum arc melting, then heat-treated at 1,200 degrees C for 1 h, water quenched, and finally annealed at 500 degrees C for 0.5 h. Their respective microstructures, elevated-temperature (600-1,000 degrees C) mechanical properties, and thermal expansion behavior were then investigated. All the alloys are characterized by a BCC structure with a grain size of c. 85-135 mu m. The results demonstrated that NbTiVZr alloy exhibits relatively high yield strength and specific strength at 600, 800, and 1,000 degrees C. Moreover, a low coefficient of thermal expansion was also obtained for this alloy when the temperature was below 750 degrees C. This study provides guidance for the engineering application of low-density refractory medium entropy alloys at elevated temperatures.
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