Liquid structure transition upon cooling of liquid Pd40Ni40P20

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Abstract
The precipitates of nano-crystals during solidification obscured the initiation of structural evolution, which in turn hid the information for the understanding of nucleation. Here, we report an endothermic liquid–liquid phase transition of Pd40Ni40P20 alloy far before the nucleation and verified with the in situ synchrotron radiation high-energy x-ray diffraction method and flash differential scanning calorimetry (DSC) analysis. The variations on structure factor, pair-distribution functions (PDFs) and coordination number proved a typical structure transition happen at around 640 °C. And the results of flash DSC confirmed the phenomenon. The observation verifies the liquid–liquid phase transition before nucleation and deepens the understanding of solidification in atomic scale.
Funding Information
  • National Natural Science Foundation of China (91860121)
  • National Natural Science Foundation of China (51727802)
  • National Key Research and Development Program of China (2017YFA0403802)
  • National Science and Technology Major Project (2017-VII-0008-0102)