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Microstructure of Nano-Crystallized Ni-P Layers Obtained by a Chemical Method

The present paper is focused on the microstructure of thin layers the Ni-P subjected to nano-crystallization from the amorphous state. The layers in this study have been produced by a chemical reduction method and crystallized in order to obtain mixed amorphous-crystalline and nano-polycrystalline microstructures. The results of investigation of microstructures obtained by annealing at the temperatures 270°C and 320°C, i.e. below the peak of crystallization (370°C), are described. The X-ray study, calorimetric analysis and microstructure observations carried out by the transmission electron microscopy revealed early stages of crystallization in amorphous state and changes in the size and shape of grains. Crystals of different sizes have been observed in crystallized materials, some of them in the nano-metres range. A correlation has been found between the P concentration in amorphous Ni-P material and the microstructure at the front of crystallization. It has been observed that crystallization process starts in the area of lower concentration of the phosphorous. The crystals in these regions have an elongated shape and form bands separated by amorphous material.