|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Directionally Solidified Ni-Al-X Ternary Eutectics for High-Temperature Applications
||G. Liu, P. Hallensleben, J. Frenzel, X. Liu, J. Pfetzing-Micklich, E. P. George
|On-Site Speaker (Planned)
||E. P. George
Many of the materials that have been considered for high-temperature applications (beyond superalloys) suffer from one or more drawbacks including insufficient strength at elevated temperatures, brittleness at low temperatures, and poor oxidation resistance. However, recent preliminary reports in the literature on arc-melted ternary eutectics containing Ni, Al, and a refractory metal, indicate that some of them can exhibit high strength combined with reasonable tensile ductility at room temperature. This potentially overcomes two of the major drawbacks of high-temperature intermetallics and composites. Here we report on the composition dependence of the microstructure and mechanical properties of directionally solidified Ni-Al-X ternaries. In addition to results of microhardness and nanoindentation measurements, we will also report results of tensile tests performed on select compositions. Wherever possible, the overall behavior of the composites will be quantitatively correlated with the properties of the constituent phases.