Using the CALPHAD method, lightweight nonequiatomic Ti₆₀(Al)_x(VCrNb)_40-x (x = 6, 8, 10, 12, and 18 at.%) medium-entropy alloys (MEAs) were designed and produced using vacuum arc melting and drop casting. The density of these cast alloys decreased with an increase in Al concentration from 5.45 to 4.79 g cm⁻³. All of these cast alloys exhibited a body-centered cubic (BCC) microstructure. However, a nanosized ordered B2 phase was identified in the cast alloys with higher Al concentrations (Al-12 and Al-18). The prediction of BCC phase formation using CALPHAD was consistent with the experimental results. These BCC-structured alloys can withstand over 50% strain at room temperature, which demonstrates excellent compressive ductility. Moreover, the results demonstrate that the as-cast Al-6 and Al-8 samples had superior plasticity under tensile testing, with a tensile strength of 1120 MPa and approximately 30% plastic strain. Furthermore, with an increase in Al concentration, the alloys exhibited a notable trend in yield strength and a decreasing trend in plastic strain. The change in mechanical properties of these MEAs caused by the formation of B2 nanoparticles was also investigated.

使用CALPHAD方法，设计并使用真空电弧生产了轻质非等原子Ti ₆₀（Al）_x（VCrNb）_40-x（x = 6、8、10、12和18 at。％）的中熵合金（MEA）熔铸和滴铸。这些铸造合金的密度随着Al浓度的增加从5.45降低至4.79 g cm ^-3。所有这些铸造合金均表现出体心立方（BCC）微观结构。但是，在具有较高Al浓度（Al-12和Al-18）的铸造合金中，发现了纳米级有序B2相。用CALPHAD预测BCC相的形成与实验结果一致。这些BCC结构的合金在室温下可承受超过50％的应变，显示出极好的压缩延展性。此外，结果表明，铸态的Al-6和Al-8样品在拉伸试验中具有优异的可塑性，拉伸强度为1120 MPa，塑性应变约为30％。此外，随着Al浓度的增加，合金表现出屈服强度的显着趋势和塑性应变的降低趋势。