Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties

Abstract

Alloys with composition of $\mathrm{Al}\mathrm{Co}\mathrm{Cr}\mathrm{Fe}\mathrm{Ni}{\mathrm{Ti}}_x$ ($x$ : molar ratio; $x=0,0.5,1,1.5$ ) were designed by using the strategy of equiatomic ratio and high entropy of mixing. The alloy system is composed mainly of body centered cubic solid solution and possesses excellent room-temperature compressive mechanical properties. Particularly for $\mathrm{Al}\mathrm{Co}\mathrm{Cr}\mathrm{Fe}\mathrm{Ni}{\mathrm{Ti}}_{0.5}$ alloy, the yield stress, fracture strength, and plastic strain are as high as $2.26\mathrm{GPa}$ , $3.14\mathrm{GPa}$ , and 23.3%, respectively, which are superior to most of the high-strength alloys such as bulk metallic glasses.