|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Development and Study of a TiNbMoAlSi Complex Concentrated Alloy with a Body-centered Cubic and Orthorhombic Microstructure
||Antoine Lacour-Gogny-Goubert, Zhao Huvelin, Philippe Vermaut, Ivan Guillot, Jean-Philippe Couzinié
|On-Site Speaker (Planned)
Refractory complex concentrated alloys (RCCAs) are potential substitutes for nickel or TiAl alloys for high temperature application in aircraft engines, between 800°C and 1000°C. In particular, the Ti-Nb-Al ternary system shows good properties, both microstructural (precipitation of a strengthening, stable orthorhombic phase) and mechanical (good room temperature ductility and high temperature resistance), but its use is limited above 800°C. In order to increase the service temperature of these alloys the effect of refractory elements addition to the ternary system was explored. Following a design method based on diffusion couples, a RCCA TiNbMoAlSi with a body-centered cubic matrix plus orthorhombic precipitates microstructure was elaborated. The microstructural (transmission electron microscopy) and mechanical (compression) properties of this alloy were then assessed in order to ascertain the effect of Mo addition. Moreover, differential thermal analysis was done to determine if Mo addition could extend the stability domain of the O phase at higher temperature.