Describing the equilibrium of complex concentrated alloys is currently a challenge because conventional design tools are optimised for dilute alloys. Nonetheless, many attempts have been made to propose new tools or update existing ones in order to predict the phases at equilibrium in the case of HEAs. However, experimentally, the majority of published literature is focussed on a few subsets of elements, such as the Cantor-based HEAs (Al, Ti, Cr, Mn, Fe, Co, Ni), or the refractory HEAs (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W). Expanding the list of experimentally investigated elements would offer valuable knowledge to (in-)validate the state-of-the-art phase prediction models. A recent model based on large scale ab initio calculations has been used to predict single-phase HEAs from a set of 40 elements. Interestingly, Zinc was highlighted as a potential alloying element favouring the formation of FCC phases. Zinc is a difficult element to work with and has yet to be investigated in detail. Very few Zn-HEAs have been processed up to now, with no consensus on the effect of Zinc on the equilibrium state. In this work, two novel Zn HEAs are investigated. The compositions were chosen in order to obtain single phase FCC alloys, as predicted by the ab initio model. Powder metallurgy was necessary to process both compositions. After densification, the alloys were heat treated to homogenize the composition and observe the evolution of the microstructure with temperature.