Effect of Plastic Deformation on the Crystal Structure and Crystallization Activation Energy of Ni-W-P Alloy Coating

Abstract

Jet electrodeposition method was used to prepare Ni-W-P amorphous alloy coating and effects of plastic deformation on the crystal structure and crystallization kinetics were investigated. Based on the results of differential scanning calorimeter, x-ray diffractometer and transmission electron microscope, it can be seen that when the plastic deformation is up to 20%, the Ni-W-P amorphous alloy coating begins to crystallize. An increase of plastic deformation will lead to a decrease of crystallization temperature as well as a decrease of crystallization activation energy calculated by Kissinger equation. The effective activation energy is reduced from 268.63 kJ/mol in the as-deposited state to 246.63 kJ/mol in the cold deformation up to 40%. Analyses were presented to discuss the possible mechanism for the effect of plastic deformation on the crystallization kinetics of the Ni-W-P amorphous alloy coatings.