| Abstract Scope |
CoCrFeNi-based High Entropy Alloys (HEA) are at the center of researchers’ attention due to their potential applications as structural materials where high ductility, fracture toughness, and resistance to corrosion, irradiation and hydrogen embrittlement are required. However, their low tensile strength impedes the usage. Precipitation hardening is one of the
mechanisms which may help to overcome this issue. Addition of Ti promotes precipitation of various phases, such as γ' ((Ni,Co)3Ti-type, Pm-3m, a=0.36nm) and/or η (Ni3Ti-type,P_63/mmc, a=0.51nm, c=0.83nm). To facilitate the usage of these HEAs, precise identification of the precipitate type as well as precipitation sequence is required. In the current research, the CoCrFeNiTi0.2 alloy was thoroughly characterized applying electron microscopy, microhardness and thermal analysis, and compared to CoCrFeNi which underwent the same thermo-mechanical treatments. As a result, the precipitation sequence and phase transition temperatures were determined. Experimental results agreed with theoretical calculations. |