Quasicrystals, structures intermediate between crystals and amorphous solids, are an exciting area of research in materials science. Their unique atomic structures, which have long-range order but no translational symmetry, lead to unusual physical and chemical properties. One of the most studied and promising quasicrystalline materials is the Al–Cu–Fe system.
Al–Cu–Fe alloys exhibit exceptional hardness and wear resistance that exceeds many traditional alloys. This makes them attractive for applications requiring high abrasion resistance, such as coatings, cutting tools, and wear-resistant components.
Quasicrystals of icosahedral structure are characterized by weak thermal conductivity and moderate electrical conductivity. Along with this, they demonstrate a fairly high thermoelectric power, which opens up opportunities for their use in thermoelectric devices. The paper presents theoretical justifications for the electrical and thermoelectric properties of two compounds of the Al–Cu–Fe quasicrystal family (i-Al62Cu25.5Fe12.5 and i-Al63Cu25Fe12). It should be noted that their performance indicators do not yet reach the level of the most common thermoelectric materials.
In addition, Al–Cu–Fe quasicrystals have low thermal conductivity. This property makes them useful as thermal insulation materials, especially under high temperature conditions. They can be used in thermal barriers, thermoelectric generators, and other devices where it is necessary to minimize heat transfer.
Al–Cu–Fe alloys also exhibit high corrosion resistance. Their surface forms a dense oxide film that protects the base material from aggressive environments. This makes them suitable for use in the chemical industry, marine environments, and other areas where corrosion resistance is required.
In conclusion, Al–Cu–Fe quasicrystals exhibit a unique combination of properties that make them valuable materials for a wide range of applications. Their high hardness, wear resistance, low thermal conductivity and corrosion resistance open up new opportunities for the creation of innovative technologies and products. Further research and development in this area will undoubtedly lead to even wider use of Al–Cu–Fe quasicrystals in the future.
Author: A Bilušić, D Pavuna, A Smontara
Institute: Institute of Physics, P.O. Box 304, HR-10001 Zagreb, Croatia, Institute of Applied Physics, Federal Polytechnic School, CH-1015 Lausanne, Switzerland