Extended Data Fig. 1: Thermodynamic evaluation for the ordering structure in the Co32Ni32V32Al2Ti2 alloy.
From: Dual-scale chemical ordering for cryogenic properties in CoNiV-based alloys
(a) Enthalpy of mixing among the elements involved in our materials. (b) Enthalpy of mixing of different elements in the fcc phase with CoNiV composition (equimolar) at 1100 °C. Al and Ti have the most negative enthalpy of mixing with the main elements, which strongly enhances the tendency for the formation of long-range ordering. (c) The promoting effect of Al and Ti addition on the formation of the L12 ordered phase aged at 750 °C, assuming that the main elements have a same atomic concentration (N(Ni) = N(Co) = N(V)). (d) Equilibrium volume fraction of different phases as a function of temperature. (e) Equilibrium composition of the L12 precipitates predicted by Thermo-Calc software. (f) Equilibrium composition (at.%) of fcc_matrix and L12 phases aged at 750 °C.
