|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Oxidation Resistant Refractory Metal – Simple Metal Complex Concentrated Alloys
||Panagiotis Tsakiropoulos, Claire Utton, Mohammad Ghadyani
|On-Site Speaker (Planned)
Refractory metal intermetallic composites (RMIC) with capabilities beyond those of state-of-the-art Ni-based superalloys will require environmentally resistant coatings. The latter could be of the bond coat (BC)/thermally-grown oxide (TGO)/ceramic top-coat (TC) type with a multi-material layered BC capable of forming Al2O3 TGO. The presentation will discuss why and how parameters based on atomic size, electronegativity and the number of valence electrons per atom filled into the valence band are used to design non-pesting and alumina scale forming refractory metal – simple metal complex concentrated alloys suitable for application as BC components. The alloys 14.5Nb-27Si-22.5Ti-32.5Al-3.5Hf, 13.5Nb-23Si-23Ti-37Al-3.5Hf and 13Nb-24Si-24Ti-35Al-4Hf will be used to demonstrate alloy design and selection. The intermediate and high temperature oxidation of these alloys will also be discussed.