First-principles study on the elastic properties of DO₁₉-Ti₃Al by the Co, Ni and Ga alloying

The effects of Co, Ni and Ga elements on the elastic properties of Ti₃Al crystals were investigated by first-principles method. The results show that Co and Ni atoms tend to displace Ti atoms and Ga atoms tend to displace Al atoms; The solid solution of Co and Ni can weaken the internal electron hybridization effect of the crystal and increase the intrinsic plasticity of Ti₃Al crystal. The effect of Co element is the best. The strength and hardness of Ti₃Al crystal will be improved after the solid solution of Ga element. (authors)