Mechanical properties and strengthening mechanism of Ti_xCrFeCoNiAl solid-solution alloys with multi-principal components

Ti_xCrFeCoNiAl alloys were designed by the novel alloy-design strategy of equal-atomic ratio and high entropy of mixing. This alloy system possesses ultra-high strength and micro-hardness. Among them, both CrFeCoNiAl and Ti0.5CrFeCoNiAl alloys have excellent comprehensive mechanical properties. Particularly for the latter, the compressive yield stress, fracture strength and plastic strain are as high as 2.259 GPa, 3.135 GPa and 23.22% respectively, which are even superior to most of the high-strength alloys. The high strength of the four alloys is attributed to the effective multi-strengthening mechanism like solid solution strengthening, nano-phase dispersion strengthening, and lattice distortion effects.