A calorimetric study of thermodynamic properties for binary Cu-Ge alloys

► The fusion enthalpy of Cu-Ge alloys in the whole composition range is measured. ► The undercoolability of Cu-Ge alloys depends on nucleation ability of primary phases. ► The intermetallic compounds ξ, ε and ε1 display non-faceted growth mode. ► Cu-Ge peritectic microstructures are composed of both primary and peritectic phases.