| Abstract Scope |
New classes of ultrahigh temperature materials, like refractory-multi-principal-element alloys (R-MPEAs), hold tremendous potential for use as structural materials that can operate in the extreme environments required for energy efficient power generation, hypersonic flight, and space access. Facilities for mechanical testing at or above 1500oC are rare and the lack of ultrahigh temperate mechanical testing represents a serious impediment for this new class of alloys, but recent development of meso-scale tensile and creep experiments that employ Joule heating has yielded much needed ultrahigh temperature tensile and creep data and increased understanding of plastic deformation at such temperatures. The tensile strength of C-103 and HfNbTaTiZr have been evaluated in high-vacuum and up to 2000 °C. The results from these experiments will be used to develop a mechanistic interpretation of the interplay between plasticity and creep in refractory alloys at such extreme temperatures. |