International Journal of Metallurgical & Materials Engineering Volume 1 (2015), Article ID 1:IJMME-107, 4 pages
http://dx.doi.org/10.15344/2455-2372/2015/107
http://dx.doi.org/10.15344/2455-2372/2015/107
Research Article
Developing New Type of High Temperature Alloys–High Entropy Superalloys
Abstract
Novel high temperature alloys – high entropy superalloys (HESA) have been developed by elevating the mixing entropies of Ni-Al-Co-Cr-Fe-Ti systems, these alloys contain stable FCC γ matrix and L12 γ' precipitates; compositions spaces are outside the scopes of traditional Ni-base superalloys and equimolar high entropy alloys. The thermal stability of high entropy γ' precipitates can be enhanced through alloy design by thermodynamic calculation based on Thermo-Calc. HESAs have potentials to high temperature structural application; alloy densities are below 8.0 g/cm3 with lower cost of raw materials than those of conventional Ni-base superalloys.