Determination of the complete metastable liquid miscibility gap in Pd–Ni–P

•Measuring metastable liquid miscibility gap (MLMG)•Undercooling•Morphological transition

Despite having a negative heat of mixing, a metastable liquid/amorphous miscibility gap (MLMG) was found below the liquidus of the alloy system, Pd–Ni–P. Earlier, a direct determination of the complete MLMG was not possible because it lies in the undercooling regime. It is known that the morphology of an alloy system that has undergone a spinodal mechanism is interconnected. In this work, a morphological transition, from eutectic to interconnectedness, was used to determine the complete MLMG of the alloy system, Pd–Ni–P.