| Abstract Scope |
In this research, the material design concept of high-entropy alloy (HEA) is proposed for Tribaloy alloys, with three HEAs being created by mixing Co based T 800 and Ni-based T-700 Tribaloy alloys in different ratios, designated as MAT46, MAT55 and MAT73, and fabricated via spark plasma sintering. The phase transformation of the mixed powders is investigated with DSC analysis. The microstructures of the SPS specimens, detected by SEM, have similar characteristics, which all consist of FCC-Co, Mo and Ni solid solution with minor HCP-Co solid solution, various Laves phase, mainly Co3Mo2Si, CoMoSi and Ni3Mo2Si, and complex intermetallic compounds. The hardness and dry-sliding wear resistance of SPS HEAs are evaluated and compared with the initial alloys. The created HEAs exhibited hardness and wear resistance between T-800 and T-700. Among the new HEAs, MAT55 having an equal ratio of T 800 and T 700, with the largest configurational entropy (1.58R), displays the best wear resistance. |