The crystallization of undercooled Pd43Ni10CU27P20 acid Pd40Ni10Cu30P20 melts is studied under isothermal conditions and at constant heating and cooling rates. Investigations are carried out by fluxing the melt with B2O3 and without any fluxing material. The isothermal experiments are performed by heating amorphous samples from below the glass transition and by cooling melts from above the liquidus temperature. The resulting time-temperature-transformation diagrams are determined and compared with each other. Furthermore, constant heating and cooling experiments are carried out, from which the critical heating and cooling rates are determined. To study the history dependence of the crystallization, the alloys are cooled with different rates into the amorphous state and the crystallization temperature upon subsequent heating is investigated. In addition, the melts are cooled to different temperatures and heated from there with a constant rate until crystallization is detected. The Pd43Ni10CU27P20 alloy exhibits a stronger history dependent crystallization than Pd40Ni10CU30P20.