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 700?C. The formation of the stable crystal structure causes a decrease in relative magnetic permeability.
Highlights
Nanostructured metallic alloys have been extensively used in electrical engineering, electronics and other industries due to their specific physical and chemical properties [1,2,3,4]
The results presented show that the microstructure of the electrodeposited nickel-cobaltmolybdenum alloy powders is dependent on deposition current density and annealing temperature
Nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath at current densities of 400, 800 and 1600 mAcm-2
Summary
Nanostructured metallic alloys have been extensively used in electrical engineering, electronics and other industries due to their specific physical and chemical properties [1,2,3,4]. Nanostructured powders of metallic alloys have found wide application in modern technologies [5,6,7]. Nanostructured nickel-cobalt alloys exhibit good electrical and magnetic properties [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]. The metallurgic production of nanostructured nickel-cobalt-molybdenum alloy powders is a rather expensive process due to high energy consumption. The properties of electrochemically obtained powders are often quite different from those of the powders of the same chemical composition
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