Microstructure and mechanical properties of MoNbVTa0.5Alx refractory high entropy alloys
Source abstract
Abstract
The specific strength of refractory high entropy alloys (RHEAs) is usually impaired due to the high density of constituent elements. In order to develop a low-density RHEA, the microstructure and mechanical property of MoNbVTa 0.5-based RHEAs with various Al additions have been investigated in this study. All samples exhibited a monolithic BCC solid solution structure. The addition of Al resulted in improved yield strength but a degraded plasticity at ambient temperature. In contrast, the yield strength consistently decreased with increasing Al content at elevated temperatures, and the softening occurred at ∼1000 °C. MoNbVTa 0.5Al 0.3 exhibited high specific strengths of 119.2 MPa cm 3/g, 108.6 MPa cm 3/g and 97.3 MPa cm 3/g at 600 °C, 800 °C, and 1000 °C, respectively.
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