Molybdenum
Molybdenum has a significant effect on the improvement of the corrosion resistance of the alloy, and also has a certain effect on the improvement of the mechanical properties of the alloy. Liu et al. explored the effect of Mo on the yield strength of CoCrFeNi high-entropy alloys. Studies have shown that as the Mo content increases from 2.44at% to 6.96at%, the yield strength of the alloy increases from 155MPa to 305.3MPa, and the alloy still maintains good ductility.
The atomic radius of Molybdenum is relatively large. When it is added to high-entropy alloys, Molybdenum dissolves in the alloy crystal structure in the form of replacing atoms, and enhances the properties of the alloy by solid solution strengthening; when the Mo content is too large, the There are not enough replacement sites to dissolve Mo, and the excess Mo promotes the formation of BCC phase in the alloy, the strength and hardness of the alloy are enhanced, and the plasticity is reduced.
Nickle
As an element widely used in superalloys, Nickle has played an important role in the process of industrial development. Because Nickle has good compatibility with most high-entropy alloy components, it is widely added to high-entropy alloys. Chen et al. studied the structure of (AlCoCrFeMo) 100-x Ni x and (CoCrCu-FeNi) 100-x Mo x series high-entropy alloys. The results show that the addition of Nickle to the alloy, which is higher than the concentration of valence electrons in the matrix, can promote the formation of the FCC phase, and the new phase formed will improve the plasticity of the alloy.
Nickle is easy to form granular compounds with Al in high-entropy alloys, which reduces the lattice distortion of the alloy. At the same time, the addition of Nickle will hinder the formation of BCC phase, reduce the B2 phase in the alloy, and promote the formation of FCC phase, resulting in the strength of the alloy. The hardness decreases and the plasticity increases.
