Process of Structural Transformation of Electrodeposited Amorphous Ni‐P Alloy by Heating

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Abstract
The process of structural transformation of electrodeposited amorphous Ni‐P alloy (hereafter referred to as a‐Ni‐P) was investigated. Heat‐treated a‐Ni‐P sample films were etched and examined with an optical microscope and three kinds of characteristic crystalline patterns were observed. Using an x‐ray diffractometer and a wavelength dispersive x‐ray spectroscope, they were identified as crystals containing Ni, crystals containing Ni, and and crystals containing Ni. Their existence ratios were obtained by measuring the areas of the respective crystalline patterns which appeared on the surface of the sample films. In addition, the existence ratios in the process of quantitative growths and disappearances of the crystals during heat‐treatment of electrodeposited a‐Ni‐P under constant heating rate were calculated as functions of temperature. It was confirmed that the results of calculations agree well with the quantitative measurements of crystal growths and disappearances in sample films.

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