| Abstract Scope |
Order and disorder are the dominant parameters in the materials science, as entropy is a measure of the disorder, thus the high-entropy alloys and amorphous alloys, which are mainly focused on their order and disorder, the high entropy alloys are dominated by the chemical disorder, while the amorphous alloys are dominated by the topological disorder. Intermetallic compounds are usually chemically ordered phases. Materials development of the human being is a process of the increasing of varies disorders or entropy to meet the complex performance conditions. The criteria to define the high entropy alloys also are changing from 1.62R, 1.5R, to 1R, R is the gas constant. Medium entropy can be those alloys with lower entropy than that of the high entropy alloys, but they are developed by using the conception of high entropy alloys. Most potential high-entropy alloys for the harsh environments are, NbTiAlSiN4, NbTiAlSiWN5, etc. |