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Boronising is a thermochemical treatment which enhances the resistivity of metals used as component in applications dominated by wear and corrosion. In this study, boronising was performed on a gamma-TiAl intermetallic alloy with the pack cementation method. The experiments took place at temperatures 1173–1323 K for 8–14 h and a compact hard boride layer was formed. Its thickness varied between 6 and 25 μm. An 80 μm wide boron diffusion zone with elevated hardness was detected  via  micro-hardness measurements. The measured thickness values were applied to a mathematical model based on Fick’s second law of diffusion to extract the kinetic parameters of the process. Additionally, the presence of the ΤiΒ 2  and the total absence of the TiB phase were confirmed via XRD measurements. The hardness of the coating and the substrate was evaluated using Vickers micro-hardness tester (above 1100 HV at the coating layer).

Kinetic study of boron diffusion in a γ-TiAl intermetallic alloy using the pack-boronising method