Abstract
In this study, a Ti2Ni/Ti2S reinforced Ti-based composite coating was fabricated using laser cladding to improve the mechanical properties of TC4 alloy. The results show that the high temperature (>3000 K) of the molten pool ensures the effectiveness of the deposited coating and the thermodynamic conditions for in situ reactions. The phases consisted of β-Ti, Ti2Ni, Ti2S, TiC, and WC. Furthermore, β-Ti nucleated and grew with TiC as heterogeneous cores due to their orientation relationships of β-Ti{100}//TiC{110} and β-Ti{110}//TiC{111}. As a result, the microhardness of the coating was 2.30 times higher than the substrate, and the wear volume decreased by 20.23 % compared to the substrate.
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