APPEARANCE OF A HYPERCOOLED LIQUID REGION FOR COMPLETELY MISCIBLE ALLOYS

Systematic calorimetric measurements on the thermodynamic properties o f several completely miscible binary alloys (Co-Pd, Co-Pt, Ni-Pd, Fe-P d, Au-Cu, Au-Ni) were performed in order to investigate the hypercooli ng abilities. Differential thermal analysis was used to determine the enthalpy of fusion of the materials and the specific heat capacity of the undercooled liquid slate in dependence on temperature and concentr ation. From the results candidate alloys are identified for experiment s on hypercooled liquids. Further on the effect of liquid undercooling on the respective microstructure evolution was investigated: The reve aled microstructures of samples solidified from the hypercooled liquid were found quite different from those obtained at low undercooling. ( C) 1997 Elsevier Science S.A.