Design av nya kolinnehållande multielementfilmer
Tidsperiod: 2019-01-01 till 2022-12-31
Projektledare: Ulf Jansson
Budget: 3 200 000 SEK
High entropy alloys are a new type of solid solution compounds where phase stability is influenced by a high entropy of mixing. Recent studies, however, have shown that although configurational entropy contributes to stability, also other factors such as vibrational entropy and kinetic limitations are important. For this reason, we use the name multi-principal element materials.This application is focused on fundamental studies of magnetron-sputtered thin films of multi-principal element alloys (MPEAs) with small amounts of carbon and multi-principal element carbides (MPECs). We have obtained preliminary results, which suggest that such thin films can exhibit unique combination of properties, e.g. high hardness combined with very high ductility and extreme corrosion resistance. In the proposed project we will combine experiments and first-principles modelling to:-Study new MPEA and MPEC thin films based on carbide-forming transition metals using rapid experimental and modeling screening techniques,-Use first principle methods to investigate stability, phase transformations and elemental segregation of these materials as well as the correlation between composition and properties,-Experimentally study the correlation between composition, structure and properties to attain a fundamental understanding of these materials,-Use controlled phase transformation to design new thin film materials with superior properties.