Abstract
A new lightweight refractory high-entropy alloy AlxCrNbTiV (x=0.2; 0.5; 0.8) was prepared by vacuum arc melting method, and the changes in the microstructure and mechanical properties of the alloy after homogenization annealing at 1200°C for 24h were analyzed. The results shew that the homogenized AlxCrNbTiV alloy consists of a biphasic structure of BCC solid solution phase and C14 Laves phase, and the volume fraction of C14 Laves phase decreases with the increase of Al content and is not uniformly distributed. The alloy microhardness increased with increasing Al content, from 610HV for Al0.2CrNbTiV alloy to 673HV for Al0.8CrNbTiV alloy. Meanwhile, the yield strength decreased from 1705MPa to 1249MPa, the compressive strain decreased from 17.8% to 12.9%, and the brittleness increased with increasing Al content.
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