Abstract Scope |
From high temperature materials that may replace Ni-based superalloys to lightweight structural alloys, refractory compositionally complex alloys (R-CCAs) containing elements from Groups IV through VI of the periodic table represent an exciting new class of alloys for future exploitation in next generation technologies. R-CCAs are most often single-phase BCC, or a majority BCC also containing secondary phases such as B2, Laves, and others. BCC alloys behave fundamentally different than FCC-based alloys, such as Al- or Ni-based superalloys, including the thermodynamically higher-order BCC-B2 phase relationship, and thermally activated plastic deformation at room temperature, leading to a ductile-to-brittle transition. This work explores the how thermodynamics affect microstructural evolution, precipitation strengthening, and even plastic deformation and ductility. |