高钛多主元合金研究进展

High-entropy alloys（HEAs）have attracted considerable attention in materials science and engineering due to distinctive cocktail that subverts traditional alloy design concept，solid-solution strengthening，and sluggish-diffusion effects. Contrast to traditional alloys，HEAs exhibit excellent mechanical properties，thermal stability，corrosion resis⁃ tance，and irradiation resistance owing to the synergistic interactions among multiple principal elements，which display promising application for extreme service environments. As an important sub-class of HEAs，Ti-rich multi-principal-element alloys（MPEAs，molar fraction ≥20%）have emerged by introducing high proportion of titanium，which inherit the multifunctional advantages of HEAs.Meanwhile，high performance is achieved while significantly reducing the overall density by virtue of low density，high specific strength，and strong corrosion resistance，addressing the grow⁃ ing demand for lightweight，high-strength structural materials in aerospace，ocean engineering，and nuclear energy. Moreover，Ti-rich MPEAs possess excellent microstructural stability and oxidation resistance at elevated temperatures，which are particularly suitable for aero-engine hot-end components，nuclear reactor structural materials，and other appli⁃ cations requiring superior high-temperature mechanical properties and corrosion resistance.Recent progress in process⁃ ing routes，phase constitution，mechanical properties，and oxidation resistance of Ti-rich MPEAs was systematically reviewed.Key insights were concluded and future development was prospected.