Characterization and Diffusion Kinetics of borided Ni–Mg Alloys

In this study, a mixture of 93% Ni–7% Mg and 97% Ni–3% Mg powders were produced by the TM method and the diffusion kinetics, surface properties of borided nickel–magnesium alloy at different temperatures and times were investigated. The samples were sintered at 530°C. The boriding process was performed Ekabor II boron powder in atmospheric furnace environment at 900, 950 and 1000°C temperatures for 1.5, 3.0 and 4.5 h. The phases in the boride layer were found by means of Cu K α radiation in XRD. XRD analysis of NiB, Ni 2 B and Ni 3 B phases were obtained. The hardness of borides layer formed on surface after boriding of the 93% Ni–7% Mg and 97% Ni–3% Mg alloys substrate ranged from 1518 to 1964 HV 0.05 , whereas value of the unborided nickel was 112–136 HV 0.05 . The boron activation energy was estimated as equal to 136.506 and 158.843 kJ/mol for the borided 93% Ni–7% Mg and 97% Ni–3% Mg alloys, respectively.