Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders

Authors

  • O. Pešić Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems Technical Faculty Čačak
  • M. Spasojević Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems Technical Faculty Čačak; Faculty of Agronomy, University of Kragujevac
  • B. Jordović Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems Technical Faculty Čačak
  • P. Spasojević Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems Technical Faculty Čačak; Faculty of Technology and Metallurgy, University of Belgrade
  • A. Maričić Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Systems Technical Faculty Čačak

Abstract

Nanostructured nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath. The powders mostly consist of an amorphous phase and a very small amount of nanocrystals with an mean size of less than 3 nm. An increase in deposition current density increases the amorphous phase percentage, the density of chaotically distributed dislocations and internal microstrains in the powders, while decreasing the mean nanocrystal size. The temperature range over which the structural relaxation of the powders deposited at higher current densities occurs is shifted towards lower temperatures. A change in relative magnetic permeability during structural relaxation is higher in powders deposited at higher current densities. Powder crystallization takes place at temperatures above 700ºC. The formation of the stable crystal structure causes a decrease in relative magnetic permeability.

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Published

2017-12-13

Issue

Vol. 46 No. 1 (2014)

Section

Articles